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Academic literature on the topic 'Magnetic fermion materials'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Magnetic fermion materials"

1

Yanagisawa, Takashi. "Zero-Energy Modes, Fractional Fermion Numbers and The Index Theorem in a Vortex-Dirac Fermion System." Symmetry 12, no. 3 (March 2, 2020): 373. http://dx.doi.org/10.3390/sym12030373.

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Physics of topological materials has attracted much attention from both physicists and mathematicians recently. The index and the fermion number of Dirac fermions play an important role in topological insulators and topological superconductors. A zero-energy mode exists when Dirac fermions couple to objects with soliton-like structure such as kinks, vortices, monopoles, strings, and branes. We discuss a system of Dirac fermions interacting with a vortex and a kink. This kind of systems will be realized on the surface of topological insulators where Dirac fermions exist. The fermion number is fractionalized and this is related to the presence of fermion zero-energy excitation modes. A zero-energy mode can be regarded as a Majorana fermion mode when the chemical potential vanishes. Our discussion includes the case where there is a half-flux quantum vortex associated with a kink in a magnetic field in a bilayer superconductor. A normalizable wave function of fermion zero-energy mode does not exist in the core of the half-flux quantum vortex. The index of Dirac operator and the fermion number have additional contributions when a soliton scalar field has a singularity.

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Ul Haq, Rukhsan, and Louis H. Kauffman. "Z2 Topological Order and Topological Protection of Majorana Fermion Qubits." Condensed Matter 6, no. 1 (February 24, 2021): 11. http://dx.doi.org/10.3390/condmat6010011.

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The Kitaev chain model exhibits topological order that manifests as topological degeneracy, Majorana edge modes and Z2 topological invariant of the bulk spectrum. This model can be obtained from a transverse field Ising model(TFIM) using the Jordan–Wigner transformation. TFIM has neither topological degeneracy nor any edge modes. Topological degeneracy associated with topological order is central to topological quantum computation. In this paper, we explore topological protection of the ground state manifold in the case of Majorana fermion models which exhibit Z2 topological order. We show that there are at least two different ways to understand this topological protection of Majorana fermion qubits: one way is based on fermionic mode operators and the other is based on anti-commuting symmetry operators. We also show how these two different ways are related to each other. We provide a very general approach to understanding the topological protection of Majorana fermion qubits in the case of lattice Hamiltonians. We then show how in topological phases in Majorana fermion models gives rise to new braid group representations. So, we give a unifying and broad perspective of topological phases in Majorana fermion models based on anti-commuting symmetry operators and braid group representations of Majorana fermions as anyons.

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LIU, S. H. "ELECTRONIC POLARON EFFECTS IN MIXED VALENCE AND HEAVY FERMION MATERIALS." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 9–13. http://dx.doi.org/10.1142/s0217979293000032.

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It is shown that the Coulomb interaction between f electrons and broad band electrons has a profound influence on the dynamical properties of an f hole in mixed valence and heavy fermion materials. At zero temperature the dynamics of the screening process contains an infrared divergence. The broadening of this divergence by temperature causes the motion of the f electrons to crossover from wave propagation to diffusion. This mechanism explains the observed dual nature of the f electrons, namely that at low temperatures they behave like a Fermi liquid, while at high temperatures they evolve into a lattice of localized magnetic moments.

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Fisk, Z. "Searching for heavy fermion materials." Physica B: Condensed Matter 378-380 (May 2006): 13–16. http://dx.doi.org/10.1016/j.physb.2006.01.018.

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Farakos, K., and N. E. Mavromatos. "Gauge-Theory Approach to Planar Doped Antiferromagnets and External Magnetic Fields." International Journal of Modern Physics B 12, no. 07n08 (March 30, 1998): 809–36. http://dx.doi.org/10.1142/s0217979298000478.

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Within the framework of a relativistic non-Abelian gauge theory approach to the physics of spin–charge separation in doped quantum antiferromagnetic planar systems, proposed recently by the authors, we are examining here the effects of constant external magnetic fields on excitations about the superconducting state in the model. The electrically-charged Dirac fermions (holons), describing excitations about specific points on the fermi surface, e.g. those corresponding to the nodes of a d-wave superconducting gap in high-T c cuprates, condense, resulting in the opening of a Kosterlitz–Thouless–like gap (KT) at such nodes. This leads, in general, to a second superconducting phase transition, which occurs at low temperatures[Formula: see text], in addition to the high-T c superconductivity [Formula: see text] due to the bulk of the fermi surface for holons in a (d-wave) spin–charge separated superconductor. In the presence of strong external magnetic fields at the surface regions of the planar superconductor, in the direction perpendicular to the superconducting planes, these KT gaps appear to be enhanced. Our preliminary analysis, based on analytic Schwinger–Dyson treatments, seems to indicate that for an even number of Dirac fermion species, required in our model as a result of gauging a particle–hole SU(2) symmetry, Parity or Time Reversal violation does not necessarily occurs. Based on these considerations, we argue that recent experimental findings, concerning thermal conductivity plateaux of quasiparticles in planar high-T c cuprates in strong external magnetic fields, may indicate the presence of such KT gaps, caused by charged Dirac-fermion excitations in these materials, as suggested in the above model.

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Chen, Changfeng. "High-spin magnetic heavy-fermion states at ferromagnet/heavy-fermion interfaces." Physica B: Condensed Matter 194-196 (February 1994): 1343–44. http://dx.doi.org/10.1016/0921-4526(94)91001-4.

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Kim, J. W., and Y. S. Kwon. "Anomalous magnetic properties of heavy fermion." Physica B: Condensed Matter 378-380 (May 2006): 833–34. http://dx.doi.org/10.1016/j.physb.2006.01.306.

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Mason, T. E., T. Petersen, G. Aeppli, W. J. L. Buyers, E. Bucher, J. D. Garrett, K. N. Clausen, and A. A. Menovsky. "Magnetic fluctuations in heavy-fermion metals." Physica B: Condensed Matter 213-214 (August 1995): 11–15. http://dx.doi.org/10.1016/0921-4526(95)00051-a.

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Tiden, N. N., P. A. Alekseev, V. N. Lazukov, A. Podlesnyak, E. S. Clementyev, and A. Furrer. "Magnetic correlations in heavy fermion CeAl3 compound." Solid State Communications 141, no. 8 (February 2007): 474–79. http://dx.doi.org/10.1016/j.ssc.2006.11.016.

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10

Flouquet, J., P. Haen, P. Lejay, P. Morin, D. Jaccard, J. Schweizer, C. Vettier, R. A. Fisher, and N. E. Phillips. "Magnetic instability in Ce heavy fermion compounds." Journal of Magnetism and Magnetic Materials 90-91 (December 1990): 377–82. http://dx.doi.org/10.1016/s0304-8853(10)80138-6.

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Dissertations / Theses on the topic "Magnetic fermion materials"

1

Saxena, Siddharth Shanker. "Magnetic and superconducting phases of heavy fermion compounds." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323011.

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Evans, Sarah Margaret Mary. "The theory of mixed valent and Kondo systems." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236121.

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Kerschl, Peter. "Magnetisierungsmessungen in hohen magnetischen Impulsfeldern." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1155114785406-30409.

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In der vorliegenden Arbeit wurden vor allem das Auftreten und der Mechanismus von feldinduzierten Übergängen und der damit verbundenen kritischen Felder untersucht. Die verwendete Magnetisierungsmessmethode ist auf die bestehende Impulsfeldanlage des IFW Dresden abgestimmt. Die Magnetisierung in Feldern bis zu 48 T wurde gemessen. Erstmals wurde für Sm2Fe17N3 der Anisotropiekoeffizient aus der Kombination der Messung des Austauschfeldes mittels inelastischer Neutronenstreuung und der Messung der Anisotropiekonstanten K1 am gleichen Material bestimmt. Für den führenden Anisotropiekoeffizienten konnte mit K1 von rund 13 MJ/m³ der Wert A20<r²> = -28 meV bestimmt werden. Der in SmCo2,5Cu2,5 und SmCo2Cu3 beobachtete Hochfeldübergang konnte mit der Mikrostruktur verknüpft werden. Die laminare Mikrostruktur bestehend aus Phasen mit unterschiedlichem Sm-Anteil ist eine notwendige Bedingung für das Auftreten des Übergangs. Das Koerzitivfeld steigt mit dem Kupfergehalt und erreicht bei tiefen Temperaturen sehr hohe Werte. Das Koerzitivfeld und das Übergangsfeld zeigen eine große magnetische Viskosität. In DyFe6Al6 wird das Verschwinden der spontanen Magnetisierung bei tiefen Temperaturen durch starke antiferromagnetische Kopplungen verursacht. Durch ein feldinduziertes magnetisches Moment an einem ungeordneten Kristallgitterplatz könnte der magnetische Übergang bei tiefen Temperaturen erklärt werden. An hexagonalem DyMn6Ge6 wurde erstmals der Temperaturverlauf des Übergangsfeldes zur gekanteten antiferromagnetischen Struktur gemessen. Oberhalb von 100 K ruft das angelegte Feld den Übergang von der helimagnetischen zu einer Fächerstruktur hervor. Bei tiefen Temperaturen tritt ein Spinflop-Übergang auf, der durch die magnetische Anisotropie des Dysprosiumions unterstützt wird. Bei magnetokalorischen Materialien zeigt sich eine Abhängigkeit der gemessenen Magnetisierung von der Feldänderungsrate. Dies lässt sich qualitativ auf die Messbedingungen zurückführen: So herrschen bei Impulsfeldmessungen adiabatische Bedingungen, während bei statischen Messungen isotherme Verhältnisse vorliegen. Neben herkömmlichen magnetischen Verbindungen wurden auch stark korrelierte Elektronensysteme untersucht. Der gefundene Magnetisierungsübergang bei 43 T in CeNi2Ge2 lässt sich auf das Unterdrücken des Kondoeffekts und das Aufbrechen der antiferromagnetischen Struktur zurückführen. Darüber hinaus wurden Magnetisierungsmessungen an Hochtemperatursupraleitern durchgeführt. Die Messungen im Impulsfeld sind ein Beitrag zur Bestimmung des Phasendiagramms von schmelztexturiertem YBa2Cu3O7-d. Das Irreversibilitätsfeld Hirr konnte an massiven Proben bis zu tiefen Temperaturen bestimmt werden. Hirr(T) zeigt einen unerwarteten linearen Anstieg bis zu tiefen Temperaturen. Aufgrund der hohen Feldänderungsraten und großen Unterschiede von Ummagnetisierungsprozessen in magnetischen Materialien gibt es derzeit keine einheitliche Beschreibung der magnetischen Viskosität für Feldänderungsraten im Bereich von 0,001 bis zu 1000 T/s. Durch die Messung im Impulsfeld konnte die Größenordnung der magnetischen Viskosität in nanokristallinem Bariumferrit bestimmt werden. Magnetisierungsmessungen im Impulsfeld stellen sowohl durch das hohe Magnetfeld als auch aufgrund der hohen bzw. variierenden Feldänderungsrate ein sehr nützliches Instrument zur Untersuchung feld- und zeitabhängiger Eigenschaften von Festkörpern dar
In this work, the occurrence and the mechanism of field induced transitions and the related critical fields were investigated. The way of measuring the magnetisation was designed for the existing pulsed field device of the IFW Dresden. The magnetisation was measured in fields up to 48 T. For the first time, the anisotropy coefficient of Sm2Fe17N3 was obtained in the combined measurement of the exchange field via inelastic neutron scattering and the measurement of the anisotropy constant K1 for the same material. For the leading anisotropy coefficient, a value of A20<r²> = -28 meV was found using K1 of about 13 MJ/m³. It was shown that the observed high field transition in SmCo2.5Cu2.5 and SmCo2Cu3 is connected with the microstructure. The laminar microstructure consisting of phases with different Sm-content is a necessary precondition for the occurrence of the transition. The coercivity increases with the Cu-content and reaches high values at low temperature. The coercivity and the transition field show big magnetic viscosity. In DyFe6Al6, the disappearance of the spontaneous magnetisation at low temperature is caused by a strong antiferromagnetic coupling. The magnetic transition at low temperature could be explained by a field induced magnetic moment on a disordered crystal site. For the hexagonal DyMn6Ge6, the temperature dependence of the transition field towards the canted antiferromagnetic structure was measured for the first time. Above 100 K, the applied field causes the transition from the helimagnetic to the fan structure. At low temperature, a spin flop transition occurs, which is supported by the magnetic anisotropy of the Dy-ion. The magnetisation of magnetocaloric materials exhibits a dependence of the field changing rate. This can be explained qualitatively by the measurement condition: The pulsed field measurement is adiabatic, whereas during static measurements, the condition is isothermal. Besides common magnetic compounds, highly correlated electron systems were also investigated. The magnetic transition at 43 T in CeNi2Ge2 can be explained by the suppression of the Kondo effect and the breaking up of the antiferromagnetic structure. Furthermore, magnetisation of high temperature superconductors was measured. The measurements in the pulsed field are a contribution to the determination of the phase diagram of melt textured YBa2Cu3O7-d. The irreversibility field Hirr was measured for bulk samples down to low temperature. Hirr(T) shows an unexpected linear increase down to low temperature. Because of the high field-changing rates and the big differences of magnetisation processes in magnetic materials, there is no uniform description of the magnetic viscosity for field changing rates in the magnitude from 0,001 up to 1000 T/s. By the measurement in the pulsed field, the magnitude of the magnetic viscosity of nanocrystalline barium ferrite was determined. Magnetisation measurement in pulsed fields is a very useful instrument to investigate field and time dependent properties of solids due to their high magnetic field and their high and varying field changing rate

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Hu, Tao. "The Interplay Between Magnetism and Superconductivity in Strongly Correlated Materials." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1254297944.

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Haines, Charles Robert Sebastian. "Pressure tuned magnetism in d- and f-electron materials." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/282990.

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Quantum phase transitions (QPT) on the border of magnetism have provided a fertile hunting ground for the discovery of new states of matter, for example; the marginal Fermi Liquid and non Fermi Liquid states as well high T$_C$ cuprate and magnetically mediated superconductivity. In this thesis I present work on three materials in which it may be possible to tune the system through a magnetic QPT with the application of hydrostatic pressure. Although the details of the underlying physics are different in each of the materials, they are linked by the possibility of finding new states on the border of magnetism. Applying hydrostatic pressure, we have suppressed the ferromagnetic (FM) transition in metallic Fe$_2$P to very low temperature and to a potential QPT. Counter-intuitive broadening of the magnetic hysteresis leading up to the FM-AFM QPT may well be a crucial clue as to the nature of the model needed to understand this phase transition. A sharp increase in the quasi-particle scattering cross-section as well as the residual resistivity accompany a departure from the quadratic temperature dependence of the resistivity. This possible deviation from Fermi liquid behaviour is stable over a significant range of temperature. The unexplained upturn in the resistivity of CeGe that accompanies the AFM transition was studied under pressure. Pressure increased the residual resistivity as well as decreasing the relative size of the upturn, but had a moderate effect on the Neel temperature. The insensitivity of the N$\acute e$el temperature to pressure has been compared to its relative sensitivity to applied feld. The existence of the upturn and its evolution with pressure and applied feld can reasonably be argued to be due to the details of the electron band structure in the system. By applying pressure we have drastically reduced the resistivity of the insulating antiferromagnet NiPS$_3$. Concurrent work on FePS$_3$ has shown metallisation under pressure. It seems reasonable to speculate that NiPS$_3$ may also metallise at higher pressure. The energy gap is narrowed in both materials as pressure is increased. Magnetisation measurements have revealed a low temperature upturn indicating some possible ferromagnetic component or proximity to another magnetic state. A peak in the magnetisation is also seen at 45K in zero-feld cooled measurements. Both of these features point to a system with a complex magnetic ground state.

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Blake, Samuel. "Exploring the Fermi surfaces of novel quantum materials using high magnetic fields." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:f5f618eb-f513-4a64-a599-4f404c2090bf.

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This thesis presents the results of torque magnetometry and resistivity measurements of the electronic structure of novel quantum materials, specifically using the techniques of quantum oscillations and angle-dependent magnetoresistance oscillations. Measurements of the Fermi surfaces of these materials, alongside comparisons to the electronic structure predicted by density functional theory calculations, can elucidate much about the novel physical properties they exhibit and the competing interactions which govern their phase diagrams. The first system studied is the Iron-based superconductor FeSe_1-xS_x, an isoelectronically doped version of a system of much current interest, FeSe. Doping up to x = 0.2 is found to suppress the structural transition in this system entirely, with superconductivity continually present at low temperatures. Shubnikov-de Haas measurements across this range find a small quasi-two dimensional Fermi surface that increases in size and warping continuously with doping, with orbital dependent effective masses that do not change significantly within the orthorhombic phase. The second material studied is the antiferromagnetic intermetallic CeZn₁₁ which, featuring an unpaired 4f electron, is considered a possible candidate for heavy fermion behaviour. De Haas-van Alphen oscillations are seen once the antiferromagnetic phase is suppressed, and comparable frequencies of oscillation are measured in the non-magnetic analogue LaZn11, although with relatively smaller effective masses. GGA+U calculations, once magnetic breakdown is considered, match well the measured frequencies, confirming CeZn₁₁ to be a localised moment system with the 4f electron well below the Fermi level. The final material studied is the transition metal dichalcogenide IrTe₂, which undergoes dimerisation upon cooling into a number of possible charge modulated structures. Low temperature de Haas-van Alphen measurements find multiple domains of a quasi-two dimensional Fermi surface, no longer perpendicular to the lattice planes. Angular-dependent magnetoresistance oscillations observe a similarly tilted quasi-one dimensional Fermi surface, again with many domains present. Together these measurements confirm the unusual dimensionality of the dimerised Fermi surface of IrTe₂.

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Vernière, Anne. "Etude de siliciures ternaires : élaboration, propriétés structurales et magnétiques." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10213.

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La partie principale de cette these est consacree a l'etude du compose a fermions lourds uir#2si#2. L'elaboration de monocristaux de grande purete chimique en a ete une etape importante. L'etude et la mise au point d'un nouveau four de tirage czochralski a chauffage tri-arcs sont decrites. Cet appareillage, entierement concu en technique ultravide, a permis la synthese de monocristaux dont les caracteristiques sont meilleures que celles publiees, jusqu'a ce jour. La recherche de nouveaux intermetalliques ternaires proches, dans le diagramme d'equilibre, des composes a fermions lourds de formule generale 1-2-2 est egalement abordee. Trois nouvelles familles de composes ont ete ainsi mises en evidence: m#2t#3x, m#6t#1#6x#7 et m#4t#1#3x#9 (avec m = terre rare ou uranium, t = element de transition et x = silicium ou germanium). Leurs proprietes cristallographiques et physiques ont ete etudiees. Les composes des deux premieres familles sont paramagnetiques de type pauli. Ceux de la troisieme sont, en revanche, tous ordonnes, avec des comportements magnetiques varies. En particulier, nos mesures revelent que u#4ir#1#3si#9 et u#4ir#1#3ge#9 sont deux nouveaux fermions lourds presentant trois transitions magnetiques. Les etudes realisees au cours de ce travail sur uir#2si#2 confirment toute la complexite de ce compose a fermions lourds. Les caracterisations structurales de nos monocristaux ont mis en evidence, pour la premiere fois, l'existence de substitutions d'iridium, par du silicium, sur les deux sites cristallographiques de l'iridium. Les sites de silicium ne sont pas affectes par ce melange, ce qui n'avait jamais ete soupconne. L'influence du recuit et de la stoechiometrie sur les proprietes de uir#2si#2 est egalement presentee. Les etudes par diffraction des neutrons ont montre que uir#2si#2 est antiferromagnetique de type i, que la densite d'aimantation est isotrope et presque uniquement portee par l'uranium et qu'il existe une contribution positive supplementaire attribuable aux electrons de conduction

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Wurm, Martin. "Nouvelle expérience de résonance magnétique nucléaire (RMN) à bas champ et très basse température détectée par un SQUID." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10061.

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L'experience a ete concu pour l'etude de la supraconductivite dans des systemes a fermions lourds, qui est probablement de nature non conventionnelle. Leurs proprietes physiques dependent fortement de la qualite des echantillons, c'est pourquoi on etudie des monocristaux de haute qualite. A cause de la longueur de penetration finie de la radiofrequence dans les metaux ceci necessite de travailler a des frequences 100khz. C'est difficile avec des methodes conventionnelles de rmn, bien adaptees pour des frequences typiques de >10 mhz. Et a 100 khz, une detection a squid devient plus sensible que les methodes conventionnelles. La plus grande partie de ce travail a ete la mise au point de l'experience. Il a fallu trouver la geometrie la mieux adaptee, ecranter l'experience des perturbations electromagnetiques et diminuer le bruit cause par les vibrations. Une autre difficulte est venue de l'inevitable paramagnetisme des materiaux de construction. Il impose une excellente stabilite en temperature et d'autres precautions pour eviter les echauffements par la radiofrequence. Dans notre experience de rmn a squid on detecte la relaxation longitudinale de l'aimantation d'un echantillon apres une excitation selective des noyaux a la frequence de larmor (avec les methodes conventionnelles on utilise une detection resonante a cette frequence pour mesurer la composante transverse de l'aimantation nucleaire). La mesure du temps de relaxation spin-reseau est par consequent directe et le temps de dephasage transverse (t#2) n'influence pas la mesure. Notre experience est entierement controlee par ordinateur et permet la mesure de t#1 et de la forme de raie automatiquement en fonction de la temperature dans un champ magnetique fixe. Les resultats sur les echantillons de test montrent bien que la sensibilite du nouveau montage est suffisante pour l'etude de monocristaux de systemes a fermions lourds et a notre connaissance, elle est inegalee dans la litterature.

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Gottlieb, Ulrich. "Quelques propriétés physiques intrinsèques des siliciures métalliques et semiconducteurs." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0008.

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Dans la premiere partie nous decrivons la mise au point d'une experience de mesures de transport a basses temperatures. Nous avons construit un dispositif experimental qui permet de piloter la rotation de l'echantillon a basse temperature sous fort champ magnetique a partir de l'exterieur du cryostat. La deuxieme partie de la these est consacree a l'etude systematique des siliciures isostructuraux et isoelectroniques vsi#2, nbsi#2 et tasi#2. Les echantillons sont monocristallins. Les trois composes sont metalliques et leur resistivite a haute temperature est anisotrope. Des mesures de magnetoresistance nous ont permis d'explorer la surface de fermi de nbsi#2. Des mesures de chaleur specifique a tres basse temperature revelent que la densite d'etats electronique au niveau de fermi est deux fois plus elevee pour vsi#2 que pour les deux autres siliciures. Les temperatures de debye des trois composes varient en fonction de m##1#/#2 (m: masse molaire) indiquant que les forces interatomiques sont identiques. Nbsi#2 et tasi#2 sont supraconducteurs en dessous respectivement 130 mk et 353 mk. Des mesures de susceptibilite montrent que vsi#2 est paramagnetique, nbsi#2 et tasi#2 sont diamagnetiques. Les spectres de phonons obtenus par des mesures de spectroscopie de pointes sont en bon accord avec les temperatures de debye obtenues par les autres methodes. Des etudes sur les proprietes de transport des siliciures semiconducteurs crsi#2, resi#1#,#7#5 et ru#2si#3 sont decrites dans le troisieme chapitre. La preparation de monocristaux de ces materiaux est plus difficile que celle des siliciures metalliques. La resistivite des trois composes est anisotrope. Ru#2si#3 et resi#1#,#7#5 se comportent comme des semiconducteurs dopes en regime extrinseque. Crsi#2 montre plutot le comportement d'un mauvais metal. La magnetoresistance de ru#2si#3 a basse temperature peut s'interpreter dans un modele de localisation faible ou les interactions electron-electron sont dominantes

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Rednic, Vasile. "Investigation of electronic and magnetic structure of advanced magnetic materials." Doctoral thesis, 2010. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2010012726.

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The subject of this work subscribes to the international preoccupation regarding the elucidation of magnetic properties of solids. The crystallographic, electronic and magnetic structures of Al-Mn-Ni alloys and compounds have been investigated by X-ray diffraction, magnetization and magnetic susceptibility measurements, X-ray photoelectron spectroscopy (XPS), and band structure calculations. The thesis is organized in 6 Chapters, followed by the summary. Chapter 1 contains a brief theoretical introduction into the magnetism of metallic systems, as well the principles of XPS. The sample preparation details and all the techniques employed in the characterization of the systems are described in Chapter 2. The next 4 Chapters contain the experimental results for Mn1-xAlxNi3, Mn1-xAlxNi, Ni1-xMnxAl, Ni0.7-xAlxMn0.3 systems.

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Books on the topic "Magnetic fermion materials"

1

Lidström, Erik. Static and dynamic properties of rare earth compounds. Uppsala: Acta Universitatis Upsaliensis, 1995.

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Spin-Dependent Phenomena of Fermions in Magnetic Nanostructures. Nova Science Publishers, Incorporated, 2017.

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Chiarotti, G. F., F. Fumi, and M. Tost. Current Trends in the Physics of Materials: Proceedings of the International School of Physics Enrico Fermi, Course Cvi 20 June-8 July 1988 (Enrico Fermi International School of Physics). North-Holland, 1990.

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Electron and Photon Confinement in Semiconductor Nanostructures: Proceedings of the International School of Physics "Enrico Fermi" : Course Cl (International School of Physics Enrico Fermi). IOS Press, 2003.

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(Editor), Iosif Galanakis, and Peter H. Dederichs (Editor), eds. Half-metallic Alloys: Fundamentals and Applications (Lecture Notes in Physics). Springer, 2005.

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I, Galanakis, and Dederichs P. H. 1938-, eds. Half-metallic alloys: Fundamentals and applications. Berlin: Springer, 2005.

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Book chapters on the topic "Magnetic fermion materials"

1

Morales, F., R. Escudero, and P. Lejay. "The Antiferromagnetic State in the Heavy Fermion Superconductor URu2Si2." In New Trends in Magnetism, Magnetic Materials, and Their Applications, 337–45. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1334-0_35.

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Bernhoeft, N. "An Investigation of the Magnetic Fluctuations Above and Below Tc in the Heavy Fermion Superconductor UPd2A13." In Electron Correlations and Materials Properties, 137–51. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4715-0_8.

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Jahana, R., S. Kawaji, T. Okamoto, T. Fukase, T. Sakon, and M. Motokawa. "Transport Properties of the Half-Filled Landau Level in GaAs/AlGaAs Heterostructures: Temperature Dependence of Electrical Conductivity and Magnetoresistance of Composite Fermions." In Materials Science in Static High Magnetic Fields, 181–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56312-6_13.

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Havela, L., and V. Sechovský. "Onset of Magnetism and Non-Fermi Liquid Behaviour In UTX Compounds." In Electron Correlations and Materials Properties, 169–77. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4715-0_10.

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Schlottmann, Pedro. "Non-Fermi Liquid Behavior in Heavy Fermion Systems." In Handbook of Magnetic Materials, 85–160. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63528-0.00002-4.

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Loewenhaupt, M., and K. H. Fischer. "Chapter 6 Neutron scattering on heavy fermion and valence fluctuation 4f-systems." In Handbook of Magnetic Materials, 503–608. Elsevier, 1993. http://dx.doi.org/10.1016/s1567-2719(05)80047-2.

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Nieuwenhuys, G. J. "Chapter 1 Heavy fermions and related compounds." In Handbook of Magnetic Materials, 1–56. Elsevier, 1995. http://dx.doi.org/10.1016/s1567-2719(05)80005-8.

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Kresin, Vladimir Z., Sergei G. Ovchinnikov, and Stuart A. Wolf. "Materials (II)." In Superconducting State, 309–62. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198845331.003.0007.

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Abstract:

This chapter describes the properties of a number of interesting superconducting materials. The study of phonon-mediated superconductors, such as A-15 materials and MgB₂, flourished after the discovery of the high-Tc hydrides. At present, this family displays, under high pressure, record values of Tc close to room temperature. Other interesting systems, such as pnictides, heavy fermions, and ruthenates, with their peculiar interplay of superconductivity and magnetism, are also described. Fe-based superconductors, which were recently discovered, have relatively high Tc at ambient pressure. They display a two-gap energy spectrum. Pairing in intercalated nitrides is mainly provided by acoustic plasmons. Tungsten oxides represent a new family of oxides containing elements other than copper; they form filamentary structures. A special class is formed by topological superconductors; usually their properties are caused by odd-parity pairing. The presence of the states inside of the energy gap make these superconductors similar to topological insulators.

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"Chapter Fermi Energy Levels in Semiconductors." In Electronic, Magnetic, and Optical Materials, 145–68. CRC Press, 2016. http://dx.doi.org/10.1201/9781439882603-7.

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OTT, H. R. "SUPERCONDUCTIVITY AND MAGNETISM IN HEAVY-ELECTRON MATERIALS." In Proceedings of the Yamada Conference XVIII on Superconductivity in Highly Correlated Fermion Systems, 1–5. Elsevier, 1987. http://dx.doi.org/10.1016/b978-1-4832-2920-1.50008-1.

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Conference papers on the topic "Magnetic fermion materials"

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Sarkar, R., A. Ghoshray, B. Pahari, K. Ghoshray, V. K. Anand, Z. Hossain, Amitabha Ghoshray, and Bilwadal Bandyopadhyay. "[sup 11]B NMR Study Of Possible Heavy Fermion Compound CePt[sub 2]B[sub 2]C." In MAGNETIC MATERIALS: International Conference on Magnetic Materials (ICMM-2007). AIP, 2008. http://dx.doi.org/10.1063/1.2928947.

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MINEEV, V. P., and T. CHAMPEL. "TWO-COMPONENT SUPERCONDUCTIVITY OF HEAVY FERMIONIC MATERIAL UPt3." In Physical Phenomena at High Magnetic Fields - IV. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777805_0028.

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Reports on the topic "Magnetic fermion materials"

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Mounce, Andrew, Joe Thompson, Eric Bauer, A. Reyes, and P. Kuhns. Novel Magnetic States in the Heavy-Fermion Quantum-Critical Material CeRhIn5 at High Magnetic Fields Studied by NMR. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1165175.

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