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Author: Cheuk Yin Ng
Publisher:
ISBN:
Category : Heterostructures
Languages : en
Pages : 81
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Book Description
Author: Cheuk Yin Ng
Publisher:
ISBN:
Category : Heterostructures
Languages : en
Pages : 81
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Book Description
Author: V.P. Mineev
Publisher: CRC Press
ISBN: 9789056992095
Category : Science
Languages : en
Pages : 204
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Book Description
Unconventional superconductivity (or superconductivity with a nontrivial Cooper pairing) is believed to exist in many heavy-fermion materials as well as in high temperature superconductors, and is a subject of great theoretical and experimental interest. The remarkable progress achieved in this field has not been reflected in published monographs and textbooks, and there is a gap between current research and the standard education of solid state physicists in the theory of superconductivity. This book is intended to meet this information need and includes the authors' original results.
Author: Dzhumanov Safarali
Publisher: Nova Science Publishers
ISBN: 9781620815823
Category : Technology & Engineering
Languages : en
Pages : 356
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Book Description
The study of superconductivity in solids was initiated in 1911 after the dis-covery of this phenomenon in ordinary metals by Kamerlingh-Onnes. This book presents the fundamentals of the modern microscopic theory of conventional and unconventional superconductivity in high-Tc cuprates and other systems.
Author: Karl-Heinz Bennemann
Publisher: Springer Science & Business Media
ISBN: 3540732535
Category : Technology & Engineering
Languages : en
Pages : 1568
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Book Description
This extensive and comprehensive handbook systematically reviews the basic physics, theory and recent advances in superconductivity. Covering the entire field, this unparalleled resource carefully blends theoretical studies with experimental results to provide an indispensable foundation for further research. Leading researchers, including Nobel laureates, describe the state of the art in conventional and unconventional superconductors. In addition to full-coverage of novel materials and underlying mechanisms, the handbook reflects continued, intense research into electron-phone based superconductivity.
Author: Peter Brusov
Publisher: World Scientific
ISBN: 9812771247
Category : Science
Languages : en
Pages : 859
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Book Description
This is the first monograph that strives to give a complete and detailed description of the collective modes (CMs) in unconventional superfluids and superconductors (UCSF&SC). Using the most powerful method of modern theoretical physics OCo the path (functional) integral technique OCo authors build the three- and two-dimensional models for s -, p - and d -wave pairing in neutral as well as in charged FermiOCosystems, models of superfluid BoseOCosystems and FermiOCoBoseOComixtures. Within these models they study the collective properties of such systems as superfluid 3 He, superfluid 4 He, superfluid 3 He- 4 He mixtures, superfluid 3 He-films, superfluid 3 He and superfluid 3 He- 4 He mixtures in aerogel, high temperature superconductors, heavy-fermion superconductors, superconducting films etc. Authors compare their results with experimental data and predict a lot of new experiments on CMs study. This opens for experimentalists new possibilities for search of new intriguing features of collective behavior of UCSF&SC. The monograph creates the new scientific direction OCo the spectroscopy of collective modes in unconventional superfluids and superconductors. It will be useful for both theorists and experimentalists, studying superfluids and superconductors, low temperature physics, condensed matter physics, solid state physics. It could be used by graduate students specializing in the same areas. Sample Chapter(s). Introduction (162 KB). Chapter 1: Functional Integration Method (369 KB). Contents: Functional Integration Method; Collective Excitations in Superfluid Fermi-Systems with s OCoPairing; Superfluid Phases in 3 He; The Model of 3 He; Collective Excitations in the B OCoPhase of 3 He; Collective Excitations in the A OCoPhase of 3 He; Stability of Goldstone Modes; Influence of Dipole Interaction and Magnetic Field on Collective Excitations; The Influence of the Electric Field on the Collective Excitations in 3 He and 4 He; The Order Parameter Distortion and Collective Modes in 3 HeOCo B; Collective Excitations in the Planar 2 D OCoPhase of Superfluid 3 He; Collective Excitations in the PolarOCoPhase; Superfluidity of TwoOCoDimensional and One-Dimensional Systems; BoseOCoSpectrum of Superfluid Solutions 3 He- 4 He; Novel Sound Phenomena in Impure Superfluids; Collective Modes in the HeavyOCoFermion Superconductors; Other Application of the Theory of Collective Excitations. Readership: Graduate and postgraduate students, researchers (theorists and experimentalists), in low temperature physics, superconductivity and condensed matter physics."
Author: Dzhumanov Safarali
Publisher:
ISBN: 9781620815540
Category : Copper oxide superconductors
Languages : en
Pages : 0
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Book Description
Includes bibliographical references and index.
Author: J. Ashkenazi
Publisher: Springer Science & Business Media
ISBN: 1402030851
Category : Science
Languages : en
Pages : 266
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Book Description
This volume contains the proceedings of the 2004 University of Miami Workshop on Unconventional Superconductivity. The workshop was the fourth in a series of successful meetings on High-T Superconductivity and C related topics, which took place at the James L. Knight Physics Building on the University of Miami campus in Coral Gables, Florida, in January 1991, 1995, 1999, and 2004. The workshop consisted of two consecutive events: 1. NATO Advanced Research Workshop (ARW) on New Challenges in Superconductivity: Experimental Advances and Emerging Theories, held on January 11-14, 2004; 2. Symposium on Emerging Mechanisms for High Temperature Superconductivity (SEMHTS), held on January 15-16, 2004. It is hard to write a balanced preface to a volume like this one, yet at least we try to offer the reader a taste of what was happening in this workshop. There were close to a hundred scientists from around the world, albeit fewer Russians than we had originally hoped for. Nevertheless, the workshop was very lively and we trust that this is demonstrated in this volume. The workshop included high-quality presentations on state of the art works, yet a key issue, discussed by many, was how homogeneous the cuprates are. STM data, as well as other reports, showed that the cuprate superconductors (SC’s) studied were inhomogeneous, especially in the underdoped regime; while experiments, like ARPES and magnetoresistance have established the existence of a Fermi Surface (FS), at least above some doping level, in the cuprates.
Author: Dirk Manske
Publisher: Springer Science & Business Media
ISBN: 9783540212294
Category : Science
Languages : en
Pages : 244
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Book Description
This book presents a theory for unconventional superconductivity driven by spin excitations. Using the Hubbard Hamiltonian and a self-consistent treatment of the spin excitations, the interplay between magnetism and superconductivity in various unconventional superconductors is discussed. In particular, the monograph applies this theory for Cooper-pairing due to the exchange of spin fluctuations to the case of singlet pairing in hole- and electron-doped high-Tc superconductors, and to triplet pairing in Sr2RuO4. Within the framework of a generalized Eliashberg-like treatment, calculations of both many normal and superconducting properties as well as elementary excitations are performed. The results are related to the phase diagrams of the materials which reflect the interaction between magnetism and superconductivity.
Author: Mengke Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Atomic thin quantum materials that host exotic quantum phases such as unconventional superconductivity, correlated magnetic insulating, and quantum anomalous Hall insulating states have become a new research frontier due to their intriguing physical phenomena and potential applications that may revolutionize human life. Atomic-thin quantum materials reduce the dimensionality into two, which leads to many unique properties. For example, monolayer or bilayer thin films reduce interlayer coupling compared with their 3D bulk counterparts, thus disentangling the interlayer interaction from interlayer interaction; weakened Coulomb screening at the 2D limit enhances the electron correlations; increased phase fluctuations of the order parameter make it possible for studying quasi-long range order, and quantum confinement from the third dimension may introduce quantum size effect. Thanks to the advancement of material engineering techniques, synthesis or separation of atomic thin quantum materials have become possible and popular. Among these techniques, such as molecular beam epitaxy, physical/chemical vapor deposition, and mechanical exfoliationmolecular beam epitaxy is very powerful due to its precise control of layer thickness and cleanness across a macroscopic wafer scale. Combining molecular beam epitaxy with other in-situ characterization techniques such as scanning tunneling microscopy and double-coil mutual inductance system allows us to design, control, and characterize the atomic thin quantum materials in both microscopic and macroscopic length scales. Here in this dissertation, I first briefly introduce the background motivations of the atomic thin quantum materials in the first chapter. In the second chapter, I cover the research techniques that have been employed during my graduate studies such as molecular beam epitaxy, scanning tunneling microscopy, and double-coil mutual inductance system. The third chapter is devoted to superconductivity in the 2D limit, I use monolayer indium thin film as a platform to discuss how the geometric arrangement of a monolayer indium thin-film affects the superconductivity transition temperature and superfluid density. In the fourth chapter, I use monolayer 1T phase NbSe2 as a material example to discuss the manifestation of strong electron correlation and how it leads to magnetic charge-transfer insulators in its charge density wave phase. I also discuss the interplay of local magnetic moments with metallic/superconducting states, which lead to Kondo resonances and Yu-Shiba-Rusinov-like bound states. The fifth chapter focuses on the concept of band topology and its accompanied surface states. I use intrinsic magnetic topological insulator MnBi2Te4 as a material platform to discuss the interplay of the Dirac mass gap with magnetism and its theoretical understanding. Finally, I make some concluding remarks, including so far confronted obstacles in these topics, and comment on the further steps to make for future advancement
Author: Xinyi Huang (Physicist)
Publisher:
ISBN:
Category : Iron-based superconductors
Languages : en
Pages : 133
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Book Description
The first line of research presented here is experimental studies of the abnormal free-flux-flow resistivity in the mixed state of Ba(Fe1-xCox)2As2 single crystals. The flux vortices present in the mixed state of these superconductors are induced by applying magnetic field. We performed I-V measurements on these single crystals covering a wide range of Co doping, from under-doped (x = 0.044 and 0.056), near optimally-doped (x = 0.060 and 0.072), to the over-doped (x = 0.100) regimes. We revealed an unusual flux-flow resistivity (increase in the flux-flow resistivity with decreasing temperature or applied magnetic field) over the whole doping range of Ba(Fe1-xCox)2As2 crystals. Significantly enhanced flux-flow resistivity was observed at x = 0.060, possibly related to the existence of the boundary between the purely superconducting phase and the phase where superconductivity co-exists with the SDW order. This abnormal behavior is suppressed on both the under-doped and over-doped sides of the phase diagram. In addition, the I-V measurements also reveal universal scaling behavior of flux-flow resistivity measured at different temperatures and magnetic fields. This behavior observed in all doping levels implies that the upturn is governed by the dissipation in the bulk excitations. In addition, our results imply that the viscosity coefficient has strong magnetic field and temperature dependence governed by the systems' proximity to a magnetic instability. Moreover, a relationship between critical de-pinning current and corresponding flux-flow resistivity was extracted from these I-V data in the Ba(Fe1-xCox)2As2 system. This relationship holds over the whole doping range of Ba(Fe1-xCox)2As2, as well as canonical single band conventional superconductor Nb and multiband unconventional superconductor CeCoIn5. The sign difference of the merging point in the V vs I plots between the magnetic and non-magnetic systems reveals the effect of spin fluctuations on the scattering of quasi-particles. In addition, this relationship in optimally doped Ba(Fe1-xCox)2As2 shows a temperature-dependent behavior, while it is temperature independent for the under-doped and over-doped samples. This latter result reflects the presence of a temperature-dependent secondary phase (in addition to the superconducting phase) most likely the spin density wave phase or the micro-emulsion phase. During a second line of research, heat capacity measurements were performed to study the gap structure in the hole-doped system Ba0.05K0.95Fe2As2. Our results show evidence for the existence of a three-component superconducting order parameters. The gap values are comparable with the reported values of the KFe2As2 system. The magnetic field dependence of Sommerfeld coefficient can be fitted with a square root term, a linear term, and a constant. The square root term indicates that the nodes of one of the gap are most likely accidental. It also shows that the orbital effect is important in the low magnetic field. The linear term reveals that the Zeeman effect is the dominant pair breaker at high field. After suppressing the small gap with magnetic field, this system turns to a gapless superconducting state when magnetic field is greater than 4 T.
