Relevant bibliographies by topics / 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity

Academic literature on the topic '020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity"

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Cui, Y. J., Y. L. Chen, C. H. Cheng, Y. Yang, Y. Zhang, and Y. Zhao. "Magnetic Properties and Superconductivity in GdFeAsO1−x F x." Journal of Superconductivity and Novel Magnetism 23, no. 5 (February 5, 2010): 625–28. http://dx.doi.org/10.1007/s10948-010-0699-7.

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Chen, Xiaolong, Jingkui Liang, Sishen Xie, Zhiyu Qiao, Xiaoshu Tong, and Xianran Xing. "Superconductivity and magnetic properties in Pr0.2Yb0.8−xLaxBa2Cu3O7−δ." Zeitschrift für Physik B Condensed Matter 88, no. 1 (February 1992): 1–4. http://dx.doi.org/10.1007/bf01573831.

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Shin, Seung Joon, Sung-Sik Lee, Ki-Seok Kim, Jae-Gon Eom, Jae-Hyeon Eom, and Sung-Ho Salk. "Invariant Physical Properties in High Temperature Superconductivity." Journal of Superconductivity and Novel Magnetism 23, no. 5 (March 27, 2010): 637–40. http://dx.doi.org/10.1007/s10948-010-0658-3.

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4

Guler, A., C. Boyraz, S. Avci, L. Arda, M. Özdemir, and Y. Oner. "Electronic, transport, and magnetic properties of (Ca, Ba)0.9La0.1Fe1.9Pt0.1As2 compounds." International Journal of Modern Physics B 33, no. 04 (February 10, 2019): 1950008. http://dx.doi.org/10.1142/s0217979219500085.

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Superconductivity and magnetic properties were studied for La and Pt substituted (Ca, Ba)[Formula: see text]La[Formula: see text]Fe[Formula: see text]Pt[Formula: see text]As2 samples using structural, resistivity and magnetic measurement techniques. All bulk samples were synthesized by solid-state reaction method and annealed under a specific annealing technique with a time-dependent annealing process in vacuumed quartz tubes. ThCr2Si2-type crystal structure was concluded for both samples varying with in- and out-of-plane lattice parameters. The superconducting critical temperatures were determined by resistivity and under H = 20 Oe magnetization measurements, which were performed between the temperature ranges of 0–200 K. The upper and lower critical fields were determined and possible Meissner effects were roughly figured out to understand the level of shielding from M–H measurements. The maximum critical temperature was obtained from Ca[Formula: see text]La[Formula: see text]Fe[Formula: see text]Pt[Formula: see text]As2.
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Wokulski, Z., and C. Sułkowski. "Electrical Properties and Superconductivity of TiNi1−xCx Films." Physica Status Solidi (a) 114, no. 1 (July 16, 1989): K53—K56. http://dx.doi.org/10.1002/pssa.2211140158.

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Abah, O., and M. N. Kiselev. "Thermodynamic properties of the superconductivity in quasi-two-dimensional Dirac electronic systems." European Physical Journal B 82, no. 1 (June 21, 2011): 47–52. http://dx.doi.org/10.1140/epjb/e2011-10901-0.

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Ōnuki, Yoshichika, Rikio Settai, Yasunao Miura, Hiroki Tsutsumi, Fuminori Honda, and Hisatomo Harima. "Heavy-fermion superconductivity and Fermi-surface properties under pressure." physica status solidi (b) 250, no. 3 (March 2013): 583–88. http://dx.doi.org/10.1002/pssb.201200913.

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Sigrist, Manfred. "Magnetic properties of high-temperature superconductors: Hints and tests for unconventional superconductivity." Physica B: Condensed Matter 206-207 (February 1995): 645–49. http://dx.doi.org/10.1016/0921-4526(94)00545-7.

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Aoki, D., J.-P. Brison, J. Flouquet, K. Ishida, G. Knebel, Y. Tokunaga, and Y. Yanase. "Unconventional superconductivity in UTe2." Journal of Physics: Condensed Matter 34, no. 24 (April 13, 2022): 243002. http://dx.doi.org/10.1088/1361-648x/ac5863.

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Abstract The novel spin-triplet superconductor candidate UTe2 was discovered only recently at the end of 2018 and already attracted enormous attention. We review key experimental and theoretical progress which has been achieved in different laboratories. UTe2 is a heavy-fermion paramagnet, but following the discovery of superconductivity, it has been expected to be close to a ferromagnetic instability, showing many similarities to the U-based ferromagnetic superconductors, URhGe and UCoGe. This view might be too simplistic. The competition between different types of magnetic interactions and the duality between the local and itinerant character of the 5f Uranium electrons, as well as the shift of the U valence appear as key parameters in the rich phase diagrams discovered recently under extreme conditions like low temperature, high magnetic field, and pressure. We discuss macroscopic and microscopic experiments at low temperature to clarify the normal phase properties at ambient pressure for field applied along the three axis of this orthorhombic structure. Special attention will be given to the occurrence of a metamagnetic transition at H m = 35 T for a magnetic field applied along the hard magnetic axis b. Adding external pressure leads to strong changes in the magnetic and electronic properties with a direct feedback on superconductivity. Attention is paid on the possible evolution of the Fermi surface as a function of magnetic field and pressure. Superconductivity in UTe2 is extremely rich, exhibiting various unconventional behaviors which will be highlighted. It shows an exceptionally huge superconducting upper critical field with a re-entrant behavior under magnetic field and the occurrence of multiple superconducting phases in the temperature-field-pressure phase diagrams. There is evidence for spin-triplet pairing. Experimental indications exist for chiral superconductivity and spontaneous time reversal symmetry breaking in the superconducting state. Different theoretical approaches will be described. Notably we discuss that UTe2 is a possible example for the realization of a fascinating topological superconductor. Exploring superconductivity in UTe2 reemphasizes that U-based heavy fermion compounds give unique examples to study and understand the strong interplay between the normal and superconducting properties in strongly correlated electron systems.
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Zhou, H. M., Y. Yang, G. Li, C. H. Cheng, M. H. Pu, and Y. Zhao. "Mn doping effect on superconductivity and magnetic properties of Nd1.85Ce0.15CuO4 system." Physica C: Superconductivity and its Applications 463-465 (October 2007): 170–73. http://dx.doi.org/10.1016/j.physc.2007.04.324.

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Dissertations / Theses on the topic "020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity"

1

Haigh, Tania J. "Bose-Einstein condensates in coupled co-planar double-ring traps : a thesis presented in partial fulfillment of the requirements for the degree of Masterate of Science in Physics at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/975.

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This thesis presents a theoretical study of Bose-Einstein condensates in a doublering trap. In particular, we determine the ground states of the condensate in the double-ring trap that arise from the interplay of quantum tunnelling and the trap’s rotation. The trap geometry is a concentric ring system, where the inner ring is of smaller radius than the outer ring and both lie in the same two-dimensional plane. Due to the difference in radii between the inner and outer rings, the angular momentum that minimises the kinetic energy of a condensate when confined in the individual rings is different at most frequencies. This preference is in direct competition with the tunnel coupling of the rings which favours the same angular momentum states being occupied in both rings. Our calculations show that at low tunnel coupling ground state solutions exist where the expectation value of angular momentum per atom in each ring differs by approximately an integer multiple. The energy of these solutions is minimised by maintaining a uniform phase difference around most of the ring, and introducing a Josephson vortex between the inner and outer rings. A Josephson vortex is identified by a 2p step in the relative phase between the two rings, and accounts for one quantum of circulation. We discuss similarities and differences between Josephson vortices in cold-atom systems and in superconducting Josephson junctions. Josephson vortices are actuated by a sudden change in the trapping potential. After this change Josephson vortices rotate around the double-ring system at a different frequency to the rotation of the double-ring potential. Numerical studies of the dependence of the velocity on the ground state tunnel coupling and interaction strength are presented. An analytical theory of the Josephson vortex dynamics is also presented which is consistent with our numerical results.
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Park, Jongik. "Photoemission Study of the Rare Earth Intermetallic Compounds RNi2Ge2 (R=Eu, Gd)." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835299-eRe3PQ/webviewable/.

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(7023134), Ian Asher Arnold. "Parafermion Excitations in Hole Systems in the ν=1/3 Filled Fractional Quantum Hall State." Thesis, 2019.

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Non-Abelian excitations, including Majorana fermions, parafermions, and Fibonacci anyons, provide potential new settings for realizations of topological quantum computation operations. Topological quantum systems have the advantage of being protected against some types of entanglement with the surrounding environment, but their elusive nature has inspired many to pursue rare systems in which they may be physically realized. In this work we present a new platform for production of parafermions in the ν=1/3 fractional quantum hall effect regime in a two-dimensional hole gas in a Gallium Arsenide quantum well, where spin transitions in the rich Γ8 Luttinger ground state can be manipulated by gate-controlled electric fields. When numerical and analytical calculations of many-particle interactions combine with a proximity-induced superconducting pairing potential in this system, the spin transition we observe gives rise to a superconducting gap with an onset of six-fold degenerate ground state which disappears at critical values of the gap parameter Δk, the energetic signature associated with parafermion production.
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(11203593), Timothy Sean Wolfe. "ELECTRONIC AND OPTICAL PROPERTIES OF FIRST-ROW TRANSITION METALS IN 4H-SIC FOR PHOTOCONDUCTIVE SWITCHING." Thesis, 2021.

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Photoconductive Semiconductor Switches (PCSS) are metal-semiconductor-metal devices used to switch an electrical signal through photoconduction. Rapidly switched PCSS under high bias voltages have shown remarkable potential for high power electronic and electromagnetic wave generation, but are dependent on precise optoelectronic material parameters such as defect ionization energy and optical absorption. These properties can be measured but are difficult to attribute definitively to specific defects and materials without the aid of high-accuracy, predictive modeling and simulation. This work combines well-established methods for first principles electronic structure calculations such as Density Functional Theory (DFT) with novel modern approaches such as Local Moment Counter Charge (LMCC) boundary conditions to adequately describe charge states and Maximally Localized Wannier Functions (MLWF) to render the summation of optical excitation paths as computationally tractable. This approach is demonstrated to overcome previous barriers to obtaining reliable qualitative or quantitative results, such as DFT band gap narrowing and the prohibitive computational cost of coupled electron-phonon processes. This work contributes electronic structure calculations of 4H-SiC doped with first-row transition metals (V through Ni) that are consistent with prior published work where applicable and add new possibilities for prospective semi-insulating metal-semiconductor systems where investigating new dopant possibilities. The results indicate a spectrum of highly localized, mid-gap, spin-dependent defect energy levels which suggest a wider range of potential amphoteric dopants suitable for producing semi-insulating material. Additionally, this work contributes MLWF-based calculations of phonon-resolved optical properties in 3C and 4H-SiC, indirect gap semiconductors, which accurately produce the expected onset of optical absorption informed by experiment. These results were further expanded upon with small V-doped cells of 4H-SiC, which while not fully converged in terms of cell size still provided a qualitative point of comparison to the ground state results for determining the true optical excitation energy required for substantial photoconductivity. The subsequent speculative analysis suggests the importance of anisotropic absorption and alternative metal defects for optimizing high current optoelectronic devices such as PCSS.
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(10703055), Guodong Jiang. "INTERPLAY OF GEOMETRY WITH IMPURITIES AND DEFECTS IN TOPOLOGICAL STATES OF MATTER." Thesis, 2021.

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The discovery of topological quantum states of matter has required physicists to look beyond Landau’s theory of symmetry-breaking, previously the main paradigm for
studying states of matter. This has led also to the development of new topological theories for describing the novel properties. In this dissertation an investigation in this
frontier research area is presented, which looks at the interplay between the quantum geometry of these states, defects and disorder. After a brief introduction to the topological quantum states of matter considered herein, some aspects of my work in this area are described. First, the disorder-induced band structure engineering of topological insulator surface states is considered, which is possible due to their resilience from Anderson localization, and believed to be a consequence of their topological origin.
Next, the idiosyncratic behavior of these same surface states is considered, as observed in experiments on thin film topological insulators, in response to competition between
hybridization effects and an in-plane magnetic field. Then moving in a very different direction, the uncovering of topological ‘gravitational’ response is explained: the
topologically-protected charge response of two dimensional gapped electronic topological states to a special kind of 0-dimensional boundary – a disclination – that encodes spatial curvature. Finally, an intriguing relation between the gravitational response of quantum Hall states, and their response to an apparently unrelated perturbation – nonuniform electric fields is reported.
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(7551479), Brian Matthew Sutton. "On Spin-inspired Realization of Quantum and Probabilistic Computing." Thesis, 2019.

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The decline of Moore's law has catalyzed a significant effort to identify beyond-CMOS devices and architectures for the coming decades. A multitude of classical and quantum systems have been proposed to address this challenge, and spintronics has emerged as a promising approach for these post-Moore systems. Many of these architectures are tailored specifically for applications in combinatorial optimization and machine learning. Here we propose the use of spintronics for such applications by exploring two distinct but related computing paradigms. First, the use of spin-currents to manipulate and control quantum information is investigated with demonstrated high-fidelity gate operation. This control is accomplished through repeated entanglement and measurement of a stationary qubit with a flying-spin through spin-torque like effects. Secondly, by transitioning from single-spin quantum bits to larger spin ensembles, we then explore the use of stochastic nanomagnets to realize a probabilistic system that is intrinsically governed by Boltzmann statistics. The nanomagnets explore the search space at rapid speeds and can be used in a wide-range of applications including optimization and quantum emulation by encoding the solution to a given problem as the ground state of the equivalent Boltzmann machine. These applications are demonstrated through hardware emulation using an all-digital autonomous probabilistic circuit.
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