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Academic literature on the topic 'Antiferromagnetism'

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Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Antiferromagnetism"

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Zhou, Wenda, Mingyue Chen, Cailei Yuan, He Huang, Jingyan Zhang, Yanfei Wu, Xinqi Zheng, et al. "Antiferromagnetic Phase Induced by Nitrogen Doping in 2D Cr2S3." Materials 15, no. 5 (February 24, 2022): 1716. http://dx.doi.org/10.3390/ma15051716.

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Exploration for the new members of air-stable 2D antiferromagnetic magnets to widen the magnetic families has drawn great attention due to its potential applications in spintronic devices. In addition to seeking the intrinsic antiferromagnets, externally introducing antiferromagnetic ordering in existing 2D materials, such as structural regulation and phase engineering, may be a promising way to modulate antiferromagnetism in the 2D limit. In this work, the in situ nitrogen doping growth of ultrathin 2D Cr2S3 nanoflakes has been achieved. Antiferromagnetic ordering in 2D Cr2S3 nanoflakes can be triggered by nitrogen doping induced new phase (space group P3¯1c). This work provides a new route to realize antiferromagnetism in atomically thin 2D magnets and greatly extend applications of 2D magnets in valleytronics and spintronics.
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SCHULZ, H. J. "Incommensurate Antiferromagnetism and Magnetic Domain Walls in the Two-Dimensional Hubbard Model." International Journal of Modern Physics B 03, no. 12 (December 1989): 1887–903. http://dx.doi.org/10.1142/s0217979289001226.

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The antiferromagnetism of the two-dimensional Hubbard model is investigated analytically and numerically in the vicinity of half-filling. It is found that for a small but finite concentration of holes a regularly spaced array of domain walls is formed, with the holes localized at the domain walls, i.e. one has an insulating incommensurate antifer romagnet, with a linearly polarized magnetisation pattern and a modulation wavevector proportional to the hole concentration. Above a critical concentration of holes, pockets of free carriers appear, coexisting with incommensurate antiferromagnetic order. Only at even higher hole concentration does the antiferromagnetism vanish completely. Based on a Landau expansion, the different possible antiferromagnetic states are discussed.
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Mai, Tran Thi Thanh, Nguyen Hong Son, and Tran Minh Tien. "Magnetic competition with different spin chiralities in kagome magnets." Journal of Physics: Conference Series 2269, no. 1 (May 1, 2022): 012006. http://dx.doi.org/10.1088/1742-6596/2269/1/012006.

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Abstract Using the Bogoliubov variational method we study the magnetic competition in a minimal model proposed for kagome magnets. The minimal model consists of itinerant electrons with their spin-orbit coupling and localized electrons with their anisotropic spin exchange. A spin exchange between localized and itinerant electrons is also included into the model, and it is anisotropic. At half filling and in the region of stable in-plane antiferromagnetism, a magnetic competition between antiferromagnetic phases with different spin chiralities is found. Depending on the sign of the hopping integral and the spin-orbit coupling, either the 1 × 1 or 3 × 3 in-plane antiferromagnetism is established. These in-plane antiferromagnetic states are characterized by distinguishable spin chiralities.
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IZYUMOV, Y. A., and V. M. LAPTEV. "COEXISTENCE OF SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM." International Journal of Modern Physics B 05, no. 04 (February 20, 1991): 563–645. http://dx.doi.org/10.1142/s0217979291000341.

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An overview of the theoretical work on the problem of the influence of the antiferromagnetic ordering of localized spins on the superconducting state is provided. Effects of the exchange interaction of electrons with localized spins, are investigated. Separate treatment is given to the electron-magnon part of this interaction. The electron-magnon contribution is shown to affect both the singlet and triplet pairings. For different antiferromagnets — a collinear antiferromagnetic structure and a simple spiral structure — we investigate in detail the effect of the electron spectrum exchange readjustment due to the magnetic structure and analyse the relation of this effect to superconductivity. The influence of nonmagnetic impurities on the superconducting transition temperature in antiferromagnets is also noted. The entire treatment is carried out in terms of a unified approach of strong-coupling theory, by invoking the use of Eliashberg equations.
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LONG, M. W. "MULTIPLE-Q STRUCTURES IN FRUSTRATED ANTIFERROMAGNETS." International Journal of Modern Physics B 07, no. 16n17 (July 30, 1993): 2981–3002. http://dx.doi.org/10.1142/s0217979293003127.

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The concepts relevant to frustrated antiferromagnets are briefly reviewed. Antiferromagnets are classified according to their symmetry groups, with non-trivial point groups leading to the possibility of multiple-Q antiferromagnetism. The role of residual degeneracy is highlighted and the manner in which this degeneracy is lifted is discussed. The physical phenomena in competition within frustrated magnets, and the states that they prefer, yield ongoing theoretical research, and the way neutron scattering can be used, in conjunction with the application of pressure and magnetic fields, to determine which of the possible magnetic structures is stabilised is under experimental scrutiny. Multiple-Q antiferromagnetism finds varied and often exotic spin states with similar energies, and as such is the setting in which phase transitions between different magnetic states can be studied.
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NOWIK, ISRAEL, and ISRAEL FELNER. "COMPETITION BETWEEN SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM." Modern Physics Letters B 05, no. 04 (February 20, 1991): 273–75. http://dx.doi.org/10.1142/s0217984991000319.

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The competition between superconductivity and Cu antiferromagnetism in the high Tc, Cu containing superconductors, ( R 1−x M x)2 CuO 4, RBa 2 Cu 3 O 7, Bi 2 Sr 2 CaCu 2 O 8 and YBa 2 Cu 4O8 is reviewed. Partial substitution of some of the ions suppresses superconductivity and leads to the establishment of antiferromagnetic order in the Cu layers.
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Shi, Taqing, Ye Xu, Ya-Jing Zou, and Zhao-Xi Wang. "Synthesis, structure and magnetic properties of copper(ii) azide." Dalton Transactions 48, no. 30 (2019): 11186–90. http://dx.doi.org/10.1039/c9dt01450k.

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A novel 3D copper(ii) azide built from 1D double chains with EE azide bridges has been synthesized by hydrothermal reaction. The magnetic analyses reveal that antiferromagnetic interactions are dominant with concomitant spin-canted antiferromagnetism.
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Yang, Xinyu, Ning Ding, Jun Chen, Ziwen Wang, Ming An, and Shuai Dong. "Electrical tuning of robust layered antiferromagnetism in MXene monolayer." Applied Physics Letters 122, no. 16 (April 17, 2023): 162403. http://dx.doi.org/10.1063/5.0142852.

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A-type antiferromagnetism, with an in-plane ferromagnetic order and the interlayer antiferromagnetic coupling, owns inborn advantages for electrical manipulations but is naturally rare in real materials except in those artificial antiferromagnetic heterostructures. Here, a robust layered antiferromagnetism with a high Néel temperature is predicted in a MXene Cr2CCl2 monolayer, which provides an ideal platform as a magnetoelectric field effect transistor. Based on first-principles calculations, we demonstrate that an electric field can induce the band splitting between spin-up and spin-down channels. Although no net magnetization is generated, the inversion symmetry between the lower Cr layer and the upper Cr layer is broken via electronic cloud distortions. Moreover, this electric field can be replaced by a proximate ferroelectric layer for non-volatility. The magneto-optic Kerr effect can be used to detect this magnetoelectricity, even if it is a collinear antiferromagnet with zero magnetization.
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Кабыченков, А. Ф., and Ф. В. Лисовский. "Светоиндуцированный флексоантиферромагнитный эффект в центроантисимметричных антиферромагнетиках." Журнал технической физики 92, no. 3 (2022): 453. http://dx.doi.org/10.21883/jtf.2022.03.52140.276-21.

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It is shown that an inhomogeneous circularly polarized light wave induces components of the antiferromagnetism vector in centroantisymmetric antiferromagnets; a narrow beam of light can create a skyrmion. The analysis of the possibility of practical use of the predicted effects is carried out.
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Kubota, Takahide, Yusuke Shimada, Tomoki Tsuchiya, Tomoki Yoshikawa, Keita Ito, Yukiharu Takeda, Yuji Saitoh, Toyohiko Konno, Akio Kimura, and Koki Takanashi. "Microstructures and Interface Magnetic Moments in Mn2VAl/Fe Layered Films Showing Exchange Bias." Nanomaterials 11, no. 7 (June 30, 2021): 1723. http://dx.doi.org/10.3390/nano11071723.

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Heusler alloys are a material class exhibiting various magnetic properties, including antiferromagnetism. A typical application of antiferromagnets is exchange bias that is a shift of the magnetization curve observed in a layered structure consisting of antiferromagnetic and ferromagnetic films. In this study, a layered sample consisting of a Heusler alloy, Mn2VAl and a ferromagnet, Fe, is selected as a material system exhibiting exchange bias. Although the fully ordered Mn2VAl is known as a ferrimagnet, with an optimum fabrication condition for the Mn2VAl layer, the Mn2VAl/Fe layered structure exhibits exchange bias. The appearance of the antiferromagnetic property in the Mn2VAl is remarkable; however, the details have been unclear. To clarify the microscopic aspects on the crystal structures and magnetic moments around the Mn2VAl/Fe interface, cross-sectional scanning transmission electron microscope (STEM) observation, and synchrotron soft X-ray magnetic circular dichroism (XMCD) measurements were employed. The high-angle annular dark-field STEM images demonstrated clusters of Mn2VAl with the L21 phase distributed only around the interface to the Fe layer in the sample showing the exchange bias. Furthermore, antiferromagnetic coupling between the Mn- and Fe-moments were observed in element-specific hysteresis loops measured using the XMCD. The locally ordered L21 phase and antiferromagnetic Mn-moments in the Mn2VAl were suggested as important factors for the exchange bias.
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Dissertations / Theses on the topic "Antiferromagnetism"

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Robinson, Matthew D. "An Information Theoretic Study of the Ising Antiferromagnet with Quenched Dilution on a Triangular Lattice." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/RobinsonMD2003.pdf.

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Neves, Herbert Rodrigo. "Nanopartículas antiferromagnéticas de MnO para aplicações em biomedicina como agentes de contraste." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-17042012-165853/.

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Nanomateriais têm sido amplamente estudados, como resultado de suas propriedades físicas e químicas diferenciadas, que oferecem um grande número de possibilidades para aplicações em biomedicina, principalmente na terapia de câncer e no desenvolvimento de estratégias de diagnóstico não invasivo. O óxido de ferro superparamagnético (SPION) é o principal material estudado como agente de contraste para imagem por ressonância magnética, devido à sua capacidade de reduzir o tempo de relaxação transversal (T2) em diferentes tecidos e sua menor toxicidade que os complexos de Gd3+ e Mn2+ usados atualmente. Entretanto, o acumulo de SPIONs pode ser facilmente confundido com sinais referentes à calcificação, depósito de metais pesados e sangramentos, e a alta susceptibilidade magnética do material promove distorções na imagem. Assim, alguns aspectos são desejáveis em material para que este tenha potencial para substituir o SPION, tais como forma nanoparticulada, para fácil modificação de superfície e possibilidade de funcionalização com agentes biosseletivos, e contraste positivo em T1. As nanopartículas (NPs) antiferromagnéticas de MnO atendem a todos os requisitos necessários para substituir o óxido de ferro. As NPs de MnO foram sintetizadas a partir da decomposição térmica do acetilacetonato de manganês(II) em uma variação do método poliol modificado, resultando na formação de NPs com tamanho médio de 21 ± 3,9 nm. Foi realizada a substituição de ligantes de superfície para que se substituísse o ácido oleico adsorvido sobre o material por 3-aminopropiltrimetoxisilano (APTMS) e foi determinada a concentração de grupamentos amino sobre a superfície das NPs. Posteriormente, obteve-se uma estrutura do tipo \"core/shell\" dispersível em meio aquoso e biocompatível pela reação dos grupos amino livres com o carboxilato da carboximetil dextrana (CMDex). O potencial de superfície e a estabilidade coloidal das NPs funcionalizadas foram caracterizados por mobilidade eletroforética e por espalhamento de luz dinâmico em água deionizada e em condições que mimetizavam o sangue. As NPs apresentaram toxicidade em células cancerosas de carcinoma cervical humano (HeLa). Entretanto, não foi observada toxicidade significativa na linhagem de células não cancerosas NCTC clone L929. Tanto as NPs como sintetizadas quanto as recobertas com CMDex apresentaram controle de tamanho e forma, apresentando distribuição de tamanho compatível com o esperado para as aplicações em biomedicina.
Nanomaterials have been widely studied as a result of their interesting physical and chemical properties, which offer a large number of possibilities for applications in biomedicine mainly in cancer therapy and the development of strategies for non-invasive diagnosis. The superparamagnetic iron oxide nanoparticles (SPION) is the main studied material as contrast agent for magnetic resonance imaging (MRI) due to its ability to reduce the transverse relaxation time (T2) in different tissues and lower toxicity than Gd3+ and Mn2+ complexes currently used. However, this SPIONs accumulation can be confused with signals from calcification, bleeding or metal deposits, and the high magnetic susceptibility distorts the background image because its ferromagnetic behavior. Some aspects are desirable to replace SPIONs, such as nanoparticulate form for simple surface modification and labeling with targeting agents, and positive longitudinal T1 relaxation time contrast ability. The antiferromagnetic MnO NPs attend all these requirements and overcome the drawback of using SPION. In our study, MnO NPs were synthesized by the thermal decomposition of Mn(II) acetylacetonate by a variation of the modified polyol process resulting in spherical nanoparticles with average size of 21 ± 3,9 nm. The ligand-exchange step was used to replace the oleic acid adsorbed on the as-synthesized NPs surface by 3-aminopropyltriethoxysilane (APTMS) and the total free amine groups on the NPs surface was determined. After that, a biocompatible and water-dispersible core/shell structure was obtained by coating with carboxymethyl dextran (CMDex) using the free amine-terminal group from APTMS and the carboxylate groups present in the CMDex molecules conjungation. Surface potential and colloidal stability of these functionalized NPs were evaluated by electrophoretic mobility and dynamic light scattering techniques in both water and artificial blood by using the Simulated Body Fluid (SBF) medium. While the water-dispersible NPs have shown toxicity in the human cell line derived from cervical cancer (HeLa), they have not shown significantly cytotoxicity in the healthy fibroblast cells (cell line L929). Both the as-synthesized and coated NPs present controlled size and shape and the final NPs size distribution and magnetic properties are compatible with the expected for biomedical applications.
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Ishida, Lina. "Antiferromagnetismo nos titanatos geometricamente frustrados Sm2Ti2O7 e Nd2Ti2O7." Universidade de São Paulo, 2019. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-01022019-104912/.

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Recentemente, observamos na comunidade científica o despertar de um interesse pelo estudo de lantanídeos com base em titânio; neste ínterim, as amostras Sm2Ti2O7 e Nd2Ti2O7 se destacam por terem sido pouco exploradas, especialmente a baixas temperaturas. Análises cristalográficas de monocristais de Sm2Ti2O7 e Nd2Ti2O7 nos permitiram confirmar inicialmente características de rede como a geometria cúbica e monoclínica, respectivamente, enquanto as análises magnéticas e calorimétricas forneceram a temperatura de transição, até então inédita no caso do Nd2Ti2O7 (aproximadamente T=0,62K), além de ordenamento do tipo antiferromagnético e presença de anisotropia a altas temperaturas, na amostra de Sm2Ti2O7, e por toda a extensão de temperaturas trabalhadas, na amostra de Nd2Ti2O7. Por fim, identificamos também a entropia esperada para spins do tipo Ising em ambas as amostras.
Recently the scientific community has shown interest for titanium lanthanides, with the titanates Sm2Ti2O7 and Nd2Ti2O7 being poorly approached, specially at low temperatures. Crystallographic analysis were performed on the single crystal samples of Sm2Ti2O7 and Nd2Ti2O7, which allowed us to confirm its expected cubic and monoclinic structures, respectively; Magnetic and calorimetric data displayed the transition temperature, not previously seen in case of Nd2Ti2O7, of T=0.35K and T=0.62K, respectively, and the antiferromagnetic behaviour of both samples; Anisotropy was observed at high temperatures on the Sm2Ti2O7 data and along all the temperature range studied for the Nd2Ti2O7 sample. Finally, we have identified the entropy of Ising spins on both samples.
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Rosa, Priscila Ferrari Silveira 1988. "Physical properties of FeAs-based intermetallic compounds = Propriedades físicas de compostos intermetálicos à base de FeAs." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277008.

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Orientador: Pascoal José Giglio Pagliuso
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: O entendimento microscópico da intrincada relação entre magnetismo e supercondutividade não-convencional e atualmente um dos grandes problemas em aberto em física da matéria condensada. Em especial, compostos com estrutura cristalina tetragonal parecem favorecer a emergência de tal fenômeno. Os compostos intermetálicos tetragonais BaFe2As2 e EuFe2As2 cristalizam na estrutura tetragonal ThCr2Si2 (I 4/mmm) com camadas de FeAs separadas por átomos de bario/europio. Ambos os compostos apresentam uma distorção estrutural (tetragonal para ortorrômbica) acompanhada for uma transição de fase magnética do tipo onda de densidade de spin (ou SDW, na sigla em inglês) em TSDW = 140 K e TSDW = 190 K, respectivamente. E notável que esta fase magnética pode ser suprimida em direção ao estado supercondutor através de substituição quica ou pressão aplicada. Neste trabalho, apresentamos o estudo sistemático das propriedades do composto intermetálico tetragonal BaFe2As2 em função de tr^es parâmetros: substituição de Eu no sitio cristalográfico do Ba; substituição de metais de transição TM = Mn, Co, Ni, Cu e Ru no sitio cristalográfico do Fe e/ou pressão hidrostática. Para tal proposito, primeiramente sintetizamos amostras de alta qualidade através do método alternativo de fluxo metálico de In. A caracterização macroscópica dos compostos foi realizada através das técnicas experimentais de medidas de susceptibilidade magnética, calor especifico, resistividade elétrica em pressão ambiente e sob pressão hidrostática, além da caraterização estrutural através da difração de pó de raios-X. No que diz respeito a caracterização microscópica, a investigação experimental foi realizada através da técnica de ressonância de spin eletrônico (RSE) utilizando como provas os ons paramagnéticos de Eu2+ e Mn2+/Cu2+, além do estudo de absorção de raios-X (EXAFS) tanto na borda K do As quanto na borda do Fe. Dessa forma, foi possível investigar a dinâmica de spins no plano e fora do plano de FeAs e sua relação com as distorções locais do material. Nossos resultados evidenciam que a diminuição da distância Fe-As esta intimamente ligada a supressão da fase SDW e a localização das bandas 3d do Fe no plano Fe-As. O aumento do caráter orbital planar xy/x2 - y2 na superfície de Fermi parece ser um ingrediente propício para a emergência da supercondutividade nessa classe de compostos
Abstract: The microscopic understanding of the intricate interplay between magnetism and unconventional superconductivity is currently one of the great open questions in condensed matter physics. In particular, compounds with a tetragonal crystal structure seems to be favorable to the emergence of such phenomena. The intermetallic compounds BaFe2As2 and EuFe2As2 crystallize in the tetragonal ThCr2Si2-type structure (I 4/mmm) with FeAs sheets separated by barium/europium layers. Both compounds exhibit a structural distortion accompanied by a magnetic spin-density wave (SDW) phase transition at TSDW = 140 K and TSDW = 190 K, respectively. Remarkably, this SDW phase can be tuned toward a superconducting state by substitution and applied pressure. In this thesis, we will present a systematic study of the intermetallic tetragonal compound BaFe2As2 as a function of three parameters: Eu substitution in the Ba crystallographic site, transition metal (TM) substitution (TM = Mn, Co, Ni, Cu, and Ru) in the Fe site, and/or applied hydrostatic pressure. For this purpose, we have grown high-quality single crystals by the alternative In-ux method. The macroscopic characterization has been made by measurements of magnetic susceptibility, specic heat and electrical resistivity at ambient pressure and under hydrostatic pressure. Concerning the microscopic investigation, the experimental approach consists in using electron spin resonance (ESR) technique employing paramagnetic ions of Eu2+ and Mn2+/Cu2+ as probes in the Ba and FeAs planes, respectively and X-ray absorption spectroscopy (XANES and EXAFS) in both As and Fe K edges. In this manner, it was possible to study the site specific spin dynamics and its relation with local distortions in the material. Our results evidentiate that the decrease in the Fe-As distance is intimately related to the SDW phase suppression and to a localization of the Fe 3d bands in the FeAs plane. This increase in the planar xy/x2 - y2 orbital character at the Fermi surface appears to be a propitious ingredient to the emergence of superconductivity in this class of materials
Doutorado
Física
Doutora em Ciências
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Jesus, Camilo Bruno Ramos de 1987. "Evolução das propriedades magnéticas ao longo da série de compostos intermetálicos RTBi2 (R = Ce, Pr, Nd, Sm, Gd; T = Cu, Au)." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/320980.

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Orientador: Pascoal José Giglio Pagliuso
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Neste trabalho investigamos as propriedades estruturais e magnéticas da família de compostos intermetálicos RTBi2 (R = Ce, Pr, Nd, Sm, Gd; T = Cu, Au) além do composto CeCd0,7Sb2. As amostras foram crescidas pelo método de fluxo metálico, a maioria delas de forma inédita. Medidas macroscópicas de resistividade elétrica, susceptibilidade magnética e calor específico foram realizadas, além de medidas de espectroscopia de raios X de energia dispersiva ¿ EDS e difração de raios X. Medidas microscópicas de difração magnética de raios X e ressonância magnética nuclear (RMN) foram realizadas, com ajuda de colaboradores, no composto CeCuBi2. Um modelo de campo médio que inclui uma interação de troca isotrópica entre primeiros vizinhos e efeitos de campo cristalino tetragonal foi utilizado para ajustar as medidas de magnetização e calor específico. Esses ajustes forneceram os parâmetros e esquemas de campo cristalino e os valores das constantes da interação de troca. A partir dessas análises encontramos como que efeitos de campo cristalino e a competição entre interações magnéticas, ferromagnética e antiferromagnética, governam as propriedades magnéticas desses compostos
Abstract: In this work we have investigated the structural and magnetic properties of the family of intermetallic compounds RTBi2 (R = Ce, Pr, Nd, Sm, Gd, T = Cu, Au) and, additionally, the CeCd0.7Sb2 compound. The samples were grown by Bi metallic flux method, most of them for the first time. Macroscopic measurements of electrical resistivity, magnetic susceptibility, specific heat were carried out with supplementary measurements of Energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction. Microscopic measurements of magnetic X-ray diffraction and nuclear magnetic resonance (NMR) were carried out with the help of collaborators in the CeCuBi2 compound. A mean-field model that includes an anisotropic exchange interaction between nearest neighbors and tetragonal crystal field effects was used to fit the magnetization and specific heat data. The best fits yield the crystal field parameters and schemes of level and the values of the constants of exchange interaction for each compound in the RTBi2 series. From these analyzes, we have described how the crystal field effects and the competition between magnetic interactions, ferromagnetic and antiferromagnetic, govern the magnetic properties of these compounds
Doutorado
Física
Doutor em Ciências
1141235/2012
CAPES
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Molina, Ruiz Manel. "Nanocalorimetric studies of size effects in magnetic oxides and formation kinetics in silicides." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/298057.

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Els avenços en Nanociència i en Nanotecnologia han permès el continu desenvolupament de noves tècniques adaptades a petites mostres. En aquest context, la calorimetria és una tècnica adient per a mesurar propietats termodinàmiques i processos energètics, com transicions de fase, a través de la calor absorbida o alliberada pel sistema. Aprofitant els avenços en tècniques de microfabricació una nova família de nanocalorímetres ha emergit. Basats en cel·les calorimètriques ultralleugeres i construïts sobre membranes primes dielèctriques, aquests dispositius han manifestat tenir una millorada sensibilitat respecte als calorímetres convencionals, assolint valors menors de 1 nJ K-1 mm-2. Aquesta tècnica ha permès a diversos grups de recerca explorar nous fenòmens físics inaccessibles fins al moment. Aquest treball de recerca tracta sobre el desenvolupament i l’optimització d’aquesta tècnica: la nanocalorimetria. Incrementem el rang dinàmic d’aplicabilitat des de ritmes d’escalfament ultra ràpids fins a pràcticament isoterms, i mostrem la seva utilitat en l’estudi de diferents transicions de fase a la nanoescala. En el primer Capítol, una introducció general estableix la necessitat de desenvolupar noves tècniques de caracterització per tal de donar servei a la comunitat científica, i a més proporciona una perspectiva històrica sobre el desenvolupament dels calorímetres. A continuació, el Capítol 2 proporciona una descripció sobre el procés de microfabricació dels nanocalorímetres, i sobre disseny i fabricació de muntatges experimentals específics per dur a terme experiments nanocalorimetric des de 80 fins a 1200 K en condicions adiabàtiques. El Capítol 3 presenta les eines nanocalorimètriques emprades durant la Tesi i les millores que hi hem implementat. Els dos avenços més importants que hem assolit són: (i) L’increment dels ritmes d’escalfament, on la combinació dels mètodes polsat i de compensació de potència ens ha permès cobrir els rangs des de 0.1 fins a 106 K/s. A més, un profund estudi del càlcul de la capacitat calorífica i l’anàlisi del soroll del senyal ens ha fet obtenir una metodologia que millora qualitativament els resultats obtinguts a partir del tractament de dades. (ii) El desenvolupament d’una nova tècnica quasi-estàtica que combina les millors característiques de les tècniques DC, com el brutal augment del senyal obtingut de la nanocalorimetria adiabàtica, i les possibilitats de fer estadística que aporta la calorimetria AC. Aquesta nova tècnica ha estat anomenada nanocalorimetria d’escalfament micro-polsat, i permet mesurar transicions de fase de segon ordre amb molta sensibilitat (menys de 75 pJ K-1 mm-2 Hz-1/2), amb millors perfils de temperatura a la zona de mesura (menys de 1 K de gradient tèrmic) que fent servir mètodes polsats. Estudiem a consciència l’efecte de la mida en dos sistemes físics diferents. Al Capítol 4 presentem com la microestructura influència la interacció antiferromagnètica en capes primes de CoO. Estudiem els efectes de mida en mostres des de 1 fins a 20 nm de gruix, i la influència de les mides dels grans i les intercares des de una perspectiva termodinàmica en mostres de 20 nm de gruix. Relacionem les propietats termodinàmiques amb les magnètiques mitjançant un estudi nanocalorimetric, estructural i magnètic. Al Capítol 5 analitzem la cinètica de formació del Pd2Si a partir de bicapes de silici i pal·ladi. Mirem d’entendre la cinètica de reacció al llarg d’un ampli rang de ritmes d’escalfament que abasta sis ordres de magnitud. Per aconseguir aquesta fita, combinem calorimetria convencional i nanocalorimetria. Aquest estudi és complementat per la caracterització estructural de les mostres. També fem servir un model cinètic per a obtenir els paràmetres cinètics més rellevants mitjançant l’ajustament de les corbes calorimètriques.
The advances in Nanoscience and Nanotechnology have been paved by the continuous development of new techniques adapted to small samples. In that framework, calorimetry is a technique suitable to measure thermodynamic properties and energetic processes, such as phase transitions, through the heat absorbed or released by the system. Taking profit of advances in microfabrication techniques a new family of nanocalorimeters, based on ultra-light calorimetric cells and built up onto thin film dielectric membranes, has emerged demonstrating enhanced sensitivities compared with traditional calorimeters, reaching levels better than 1 nJ K-1 mm-2. This technique has permitted to several research groups to explore new physical phenomena inaccessible before. The present research work deals with the development and optimization of this technique: the nanocalorimetry. We enlarge the dynamic ranges of applicability from ultrafast heating rates to quasi-static ones, and we demonstrate its utility in the study of different phase transitions at nanoscale. In the first Chapter, a general introduction sets out the necessity of developing new characterization techniques to give service to the scientific community, and also provides an historical overview about the calorimeters development. Subsequently, Chapter 2 provides an overview about nanocalorimeters microfabrication process, and about design and fabrication of specific experimental setups to carry on nanocalorimetric experiments from 80 to 1200 K in adiabatic conditions. Chapter 3 presents the nanocalorimetric tools used during the Thesis and the improvements that we have implemented. The two major advances achieved are: (i) The expansion of the operating heating rates, where the combination of pulsed and power compensated methods have permitted to cover the ranges from 0.1 to 106 K/s. Moreover, a thorough study of the heat capacity calculation, and the analysis of signal noise led us to obtain a methodology that improves qualitatively the results obtained from data processing. (ii) The development of a new quasi-static technique that combines the better specificities of DC techniques, like the huge signal enhancement of adiabatic nanocalorimetry, and the averaging capabilities of AC calorimetry. This new technique has been named microsecond-pulsed heating nanocalorimetry, and it allows measuring second order phase transitions with a very high sensitivity (less than 75 pJ K-1 mm-2 Hz-1/2), with better thermal maps in the sensing area (less than 1 K thermal gradient) than using pulsed methods. We deeply study the effect of dimensionality in two different physical systems: the magnetic order-disorder transition in thin films of CoO, and the formation kinetics of thin films of Pd2Si from Pd/Si bilayers. In Chapter 4 we present how microstructure influences the antiferromagnetic interaction in CoO thin films. We study size effects in thin film samples ranging from 1 to 20 nm, and the influence of grains and boundaries sizes from a thermodynamic perspective in samples of 20 nm. We relate thermodynamic properties to magnetic ones by means of nanocalorimetric, structural, and magnetic characterization. In Chapter 5 the formation kinetics of Pd2Si is analyzed. We pursuit understand the reaction kinetics over a wide range of heating rates spanning six orders of magnitude. To achieve this purpose, we combine conventional calorimetry and nanocalorimetry. This study is complemented by the structural characterization of the samples. We also use a kinetic model to obtain the most relevant kinetic parameters by fitting the calorimetric curves.
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Beach, Kevin S. D. (Kevin Stuart David) 1975. "Magnetic-field-induced antiferromagnetism in the Kondo lattice." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28645.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.
Includes bibliographical references (p. 109-111).
The half-filled Kondo lattice model, augmented by a Zeeman term, serves as a useful model of a Kondo insulator in an applied magnetic field. A variational mean field analysis of this system on a square lattice, backed up by quantum Monte Carlo calculations, reveals an interesting separation of magnetic field scales. For Zeeman energy comparable to the Kondo energy, the spin gap closes and the system develops transverse staggered magnetic order. The charge gap, however, remains robust up to a higher hybridization energy scale, at which point the canted antiferromagnetism is exponentially suppressed and the system crosses over to a nearly-metallic regime. The quantum Monte Carlo simulations are performed using a determinant Monte Carlo method that has been extended to handle mixed spin and fermionic degrees of freedom. The formulation is sign-problem-free for all values of the Kondo coupling and magnetic field strength. The matrix operations are specially organized to maintain numerical stability down to arbitrarily low temperatures. Spectral data is extracted from the imaginary-time correlation functions using an improved analytic continuation technique. The weak, secondary peaks of the single-electron spectral function are resolvable, and their response to the magnetic field is carefully tracked. An unusual rearrangement of spectral weight is found at the onset of the antiferromagnetism.
by Kevin Stuart David Beach.
Ph.D.
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Koz, Cevriye. "Investigations on the parent compounds of Fe-chalcogenide superconductors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-205808.

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This work is focused on the parent compounds of the Fe-chalcogenide superconductors. For this purpose poly- and single-crystalline forms of tetragonal β-FexSe, Fe1+yTe, Fe1+yTe1-xSex and Fe(1+y)-xMxTe (M = Ni, Co) have been prepared. Second focal points of this study are the low-temperature structural phase transitions and physical property changes in tetragonal Fe1+yTe which are induced by composition, external pressure, and cationic substitution.
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Hooley, Chris. "The Kagome antiferromagnet and related models : studies in low-dimensional geometrically frustrated quantum magnetism." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301860.

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James, Andrew J. A. "Dynamical Correlations of Low Dimensional Quantum Magnets." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490085.

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The dynamical structure factor (DSF) is an important quantity in the characterization and understanding of quantum magnets, both experimentally and theoretically. In this thesis the DSF is calculated for three different spin-1/2 systems with reduced spatial dimensions. These are: the bond alternating Heisenberg chain; the anisotropic Heisenberg, or XXZ, chain; and n a anisotropic triangular antiferromagnet with Dzyaloshinskii-Moriya interaction. All three cases are motivated by inelastic neutron scattering experiments on realistic manifestations of the models.
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Books on the topic "Antiferromagnetism"

1

Melkov, G. A. (Gennadii A.), ed. Magnitnye kolebanii͡a i volny. Moskva: Fizmatlit, 1994.

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Saurenbach, Frank. Spinwellen und Ummagnetisierung in antiferromagnetisch gekoppelten Schichtsystemen. Jülich: Zentralbibliothek der Kernforschungsanlage, 1989.

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V, Eremenko V., Barʹi͡a︡khtar Viktor Grigorʹevich, and Fizyko-tekhnichnyĭ instytut nyzʹkykh temperatur (Akademii͡a︡ nauk Ukraïnsʹkoï RSR), eds. Magnitooptika i spektroskopii͡a︡ antiferromagnetikov. Kiev: Nauk. dumka, 1989.

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Eremenko, V. V. Magnetic and magnetoelastic properties of antiferromagnets and superconductors. [Cambridge, U.K.]: Cambridge Scientific Publishers, 2007.

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Saadaoui, Hassan. The optical conductivity of high-tc cuprates within the rotating antiferromagnetism theory. Sudbury, Ont: Laurentian University, School of Graduate Studies, 2004.

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Shamsutdinov, M. A. Ferro- i antiferromagnitodinamika: Nelineĭnye kolebanii︠a︡, volny i solitony. Ufa: Gilem, 2007.

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A, Skjeltorp, Sherrington D. C, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Study Institute on Dynamical Properties of Unconventional Magnetic Systems (1997 : Geilo, Norway), eds. Dynamical properties of unconventional magnetic systems. Dordrecht: Kluwer Academic Press, 1998.

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Lowden, Jeffrey Robert. Neutron scattering studies of the magnetic excitations in Cr, HoFe2, and Cr0.95V0.05and antiferromagnetism in Ti. Manchester: University of Manchester, 1995.

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Fradkin, Eduardo. Field theories of condensed matter systems. Redwood City, Calif: Addison-Wesley Pub. Co., 1991.

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G, Baskaran, ed. Strongly correlated electron systems II: Proceedings of the Adriatico research conference and miniworkshop, ICTP, Trieste, Italy, 18 June-27 July 1990. Singapore: World Scientific, 1991.

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Book chapters on the topic "Antiferromagnetism"

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Coey, J. M. D. "Amorphous Antiferromagnetism." In Physics of Disordered Materials, 729–38. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2513-0_59.

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Leung, T. C., B. N. Harmon, A. J. Fedro, and S. K. Sinha. "Antiferromagnetism — Beyond Band Theory." In Springer Series in Solid-State Sciences, 347–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84345-7_66.

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Fukuyama, Hidetoshi, and Hiroshi Kohno. "Antiferromagnetism, Singlet and Disorder." In Springer Series in Solid-State Sciences, 231–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60041-8_22.

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Plakida, Nikolay. "Antiferromagnetism in Cuprate Superconductors." In Springer Series in Solid-State Sciences, 51–120. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12633-8_3.

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Kakehashi, Yoshiro. "Antiferromagnetism and Spin Density Waves." In Springer Series in Solid-State Sciences, 149–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33401-6_6.

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Plakida, Nikolai M. "Antiferromagnetism in High-Temperature Superconductors." In High-Temperature Superconductivity, 33–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78406-4_3.

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Vaknin, David, Jerel L. Zarestky, Jean-Pierre Rivera, and Hans Schmid. "Antiferromagnetism in LiCoPO4 and LiNiPO4." In Magnetoelectric Interaction Phenomena in Crystals, 203–17. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2707-9_16.

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Carlin, Richard L. "Long Range Order. Ferromagnetism and Antiferromagnetism." In Magnetochemistry, 112–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70733-9_6.

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Overhauser, Albert. "Mechanism of Antiferromagnetism in Dilute Alloys." In Anomalous Effects in Simple Metals, 38–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527631469.ch15.

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Overhauser, A. W. "Spin-Density-Wave Antiferromagnetism in Potassium." In Anomalous Effects in Simple Metals, 76–79. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527631469.ch17.

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Conference papers on the topic "Antiferromagnetism"

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Hulet, Randall G., Pedro M. Duarte, Russell A. Hart, and Tsung-Lin Yang. "Antiferromagnetism with Ultracold Atoms." In XXII International Conference on Laser Spectroscopy (ICOLS2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813200616_0004.

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Fiebig, M., N. P. Duong, and T. Satoh. "Ultrafast manipulation of antiferromagnetism in NiO." In 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. IEEE, 2006. http://dx.doi.org/10.1109/cleo.2006.4629114.

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Manikandan, M., A. Muthukumaran, and C. Venkateswaran. "Induced antiferromagnetism in Mn doped BaMgF4." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4873016.

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Harigaya, Kikuo. "Theory of antiferromagnetism in C60-polymers: A1C60." In SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Zakya H. Kafafi. SPIE, 1996. http://dx.doi.org/10.1117/12.262982.

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Yan, Peng. "Antiferromagnetism emerging in a ferromagnet with gain (Conference Presentation)." In Spintronics XII, edited by Henri-Jean M. Drouhin, Jean-Eric Wegrowe, and Manijeh Razeghi. SPIE, 2019. http://dx.doi.org/10.1117/12.2528255.

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Kagayama, Tomoko, Wataru Matsuda, Katsuya Shimizu, Ai Nakamura, Masato Hedo, Takao Nakama, and Yoshichika Ōnuki. "Antiferromagnetism and Valence Fluctuation of EuCd11 at High Pressure." In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019). Journal of the Physical Society of Japan, 2020. http://dx.doi.org/10.7566/jpscp.30.011135.

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Gill, Raminder. "Coexistence of superconductivity, ferromagnetism and antiferromagnetism in iron pnictides." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946169.

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Takenobu, T. "Mott-Hubbard transition and antiferromagnetism in ammoniated alkali fullerides." In The 14th international winterschool on electronic properties of novel materials - molecular nanostructures. AIP, 2000. http://dx.doi.org/10.1063/1.1342462.

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Padam, R., A. Thamizhavel, S. Ravi, S. Ramakrishnan, and D. Pal. "Coexistence of charge density wave and antiferromagnetism in Er2Ir3Si3." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710346.

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Hiromitsu, I., J. Takeuchi, and T. Ito. "Antiferromagnetism of a conductive polymer AlPeF-Br/sub 4/." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835689.

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Reports on the topic "Antiferromagnetism"

1

Halperin, william. Antiferromagnetism and Superconductivity. Office of Scientific and Technical Information (OSTI), February 2023. http://dx.doi.org/10.2172/1958216.

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Shi, Z. P., and R. S. Fishman. The role of Cr antiferromagnetism on interlayer magnetic coupling in Fe/Cr multilayered systems. Office of Scientific and Technical Information (OSTI), June 1998. http://dx.doi.org/10.2172/304025.

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Weinstein, Marvin. Quarks, Gluons and Frustrated Antiferromagnets. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/15073.

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Fullerton, E. E., J. E. Matson, C. H. Sowers, and S. D. Bader. Antiferromagnetic interlayer coupling of Ni/Mo superlattices. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10194947.

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Fullerton, E. E., J. E. Mattson, S. R. Lee, C. H. Sowers, Y. Y. Huang, G. Felcher, S. D. Bader, and F. T. Parker. Non-oscillatory antiferromagnetic coupling in sputtered Fe/Si superlattices. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/10184587.

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Lee, Hyung-Cheol. NMR studies of the antiferromagnetic insulators SrMn 2P2 and CaMn2P2. Ames (Iowa): Iowa State University, August 2022. http://dx.doi.org/10.31274/cc-20240624-1057.

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Sklenar, Joseph, Wei Zhang, Matthias Jungfleisch, Wanjun Jiang, Hilal Saglam, John Pearson, John Ketterson, and Axel Hoffmann. Spin Hall effects in metallic antiferromagnets – perspectives for future spinorbitronics. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/2308896.

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Mankey, Gary J. UA/ORNL Collaboration: Neutron Scattering Studies of Antiferromagnetic Films, Final Report. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/887250.

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Islam, Farhan. Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF. Ames (Iowa): Iowa State University, December 2021. http://dx.doi.org/10.31274/cc-20240624-1321.

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Casadei, Cecilia. Homometallic and Heterometallic Antiferromagnetic Rings: Magnetic Properties Studied by Nuclear Magnetic Resonance. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1048524.

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