Understanding Unconventional Superconductors
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Understanding Unconventional Superconductors
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Author : In̂es Almeida Firmo
language : en
Publisher:
Release Date : 2014
Understanding Unconventional Superconductors written by In̂es Almeida Firmo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Unconventional superconductors provide, today, some of the most fundamental challenges in condensed-matter physics, besides their unimaginable potential for applications. Here, we will discuss two of these materials. Firstly, we will focus on Sr2RuO4, one of the most promising candidates to exhibit chiral pwave superconductivity, analogously to a two-dimensional (2D) film of 3 He-A. Some of the outstanding challenges regarding this multi-band superconductor remain, including the knowledge of which band(s) are primarily responsible for the appearance of superconductivity. Solving this issue will help us understand the symmetry of the pairing and, eventually, the pairing mechanism. We report scanning tunneling microscopy (STM) studies confirming a nodal superconducting gap structure and indicating that the quasi-one-dimensional (1D) bands are most important for superconductivity in Sr2RuO4. We suggest an experimental avenue to confirm this observation and determine the pairing symmetry beyond doubt. We then turn to a discussion of the hole-doped cuprate high-temperature superconductors, with a focus on their mysterious pseudogap regime and its Q = 0 and Q 0 electronic broken symmetries. Development of novel spectroscopic imaging STM (SI-STM) techniques allowed the quantitative measurement of such broken symmetries (also seen by other probes) and their inter-relations. We report on these novel techniques in detail, in particular Fourier phase determination of STM data, and study extensively the hole doping, p, dependence of the broken symmetries as well as the Fermi surface topology for Bi2Sr2CaCu2O+[delta] samples spanning the phase diagram between 0.06 [LESS-THAN OR EQUAL TO] p [LESS-THAN OR EQUAL TO] 0.23. We show that the electronic symmetry breaking tendencies weaken with increasing p and disappear close to pc = 0.19. Concomitantly, the coherent k-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc . These data reveal that the k-space topology transformation in the cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.
Unconventional Superconductors
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Author : Gernot Goll
language : en
Publisher: Springer Science & Business Media
Release Date : 2006
Unconventional Superconductors written by Gernot Goll and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
This book offers a comprehensive summary of experiments that are especially suited to reveal the order-parameter symmetry of unconventional superconductors. It briefly introduces readers to the basic theoretical concepts and terms of unconventional superconductivity, followed by a detailed overview of experimental techniques and results investigating the superconducting energy gap and phase, plus the pairing symmetry. This review includes measurements of specific heat, thermal conductivity, penetration depth and nuclearmagnetic resonance and muon-spin rotation experiments. Further, point-contact and tunnelling spectroscopy and Josephson experiments are addressed. Current understanding is reviewed from the experimental point of view. With an appendix offering five tables with almost 200 references that summarize the present results from ambient pressure heavy-fermion and noncopper-oxide superconductors, the monograph provides a valuable resource for further studies in this field.
Superconductivity
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Author : Karl-Heinz Bennemann
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-04-25
Superconductivity written by Karl-Heinz Bennemann and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-25 with Technology & Engineering categories.
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.
Introduction To Unconventional Superconductivity
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Author : V.P. Mineev
language : en
Publisher: CRC Press
Release Date : 1999-09-21
Introduction To Unconventional Superconductivity written by V.P. Mineev and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-09-21 with Science categories.
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.
Theory Of Unconventional Superconductors
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Author : Dirk Manske
language : en
Publisher:
Release Date : 2014-01-15
Theory Of Unconventional Superconductors written by Dirk Manske and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-15 with categories.
Unconventional Superconductors
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Author : Iman Askerzade
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-01-13
Unconventional Superconductors written by Iman Askerzade and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-13 with Science categories.
This book presents the anisotropy and multiband effects in newly discovered unconventional superconductors: cuprate superconductors, borocarbides, magnezium-diboride and oxypnictides. The physical properties of these unconventional superconductors and the application of the two-band Ginzburg-Landau theory to these superconducting compounds are explained. Temperature dependencies of fundamental superconducting parameters are calculated using the GL theory taking into account multiband-and anisotropy effects. A comparision of theoretical results and experimental data is conducted. Additionally, the analytical solution of the microscopical Eliashberg theory and of the BCS theory is developed for two-band and anisotropic superconductors. Fluctuation effects in newly discovered superconductors are also discussed.
Modern Classification Theory Of Superconducting Gap Nodes
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Author : Shuntaro Sumita
language : en
Publisher: Springer Nature
Release Date : 2020-12-15
Modern Classification Theory Of Superconducting Gap Nodes written by Shuntaro Sumita and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-15 with Technology & Engineering categories.
This book puts forward a modern classification theory for superconducting gap nodes, whose structures can be observed by experiments and are essential for understanding unconventional superconductivity. In the first part of the book, the classification method, based on group theory and K theory, is introduced in a step-by-step, pedagogical way. In turn, the latter part presents comprehensive classification tables, which include various nontrivial gap (node) structures, which are not predicted by the Sigrist-Ueda method, but are by the new method. The results obtained here show that crystal symmetry and/or angular momentum impose critical constraints on the superconducting gap structures. Lastly, the book lists a range of candidate superconductors for the nontrivial gap nodes. The classification methods and tables presented here offer an essential basis for further investigations into unconventional superconductivity. They indicate that previous experimental studies should be reinterpreted, while future experiments should reflect the new excitation spectrum.
Microwave Analysis Of Unconventional Superconductors With Coplanar Resonator Techniques
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Author : Gianluca Ghigo
language : en
Publisher: Springer Nature
Release Date : 2022-01-29
Microwave Analysis Of Unconventional Superconductors With Coplanar Resonator Techniques written by Gianluca Ghigo and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-29 with Technology & Engineering categories.
This book provides a thorough overview of methods and approaches to the experimental characterization of superconductors at microwave frequencies, and includes a detailed description of the two main techniques, both based on the use of coplanar waveguide resonators, that the authors employed to investigate the properties of unconventional superconductors. In the second part several case studies are described, covering a large spectrum of materials and issues. Particular emphasis is given to recent hot topics concerning iron-based superconductors, both of fundamental nature and relevant for applications. The book is intended as a learning tool for researchers in the field, and serves as a guide providing inspiring examples of the use of coplanar resonator techniques to address key topics in the field of unconventional superconductivity.
Studies Of Unconventional Superconductivity
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Author : Weejee Cho
language : en
Publisher:
Release Date : 2016
Studies Of Unconventional Superconductivity written by Weejee Cho and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The physics of unconventional superconductors has been studied for decades but is still not well understood. The present thesis consists of two parts, each intended to shed light on some aspects of this long-standing problem. In the first part, I discuss, based on the Hubbard model in the weak-coupling limit, how the repulsion between electrons gives rise to Cooper pairing. I present simple rules that connect the features of the band structure to those of the gap function, as well as detailed numerical results for various model systems. In the second part, I focus on symmetry constraints on light reflection; a precise understanding of this issue is essential for identifying broken symmetries in various unconventional superconductors from polar Kerr effect measurements. Using a Green's function approach, I prove that the Onsager symmetry of the nonlocal electromagnetic response function implies the absence of the polar Kerr effect in backscattering.
Theory Of Unconventional Superconductors
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Author : Dirk Manske
language : en
Publisher: Springer Science & Business Media
Release Date : 2004-06-25
Theory Of Unconventional Superconductors written by Dirk Manske and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-06-25 with Science categories.
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.