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Superconductivity

Author: G P Malik
Publisher: World Scientific
ISBN: 9814733091
Size: 24.48 MB
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Given the Debye temperature of an elemental superconductor (SC) and its Tc, BCS theory enables one to predict the value of its gap Δ0 at T = 0, or vice versa. This monograph shows that non-elemental SCs can be similarly dealt with via the generalized BCS equations (GBCSEs) which, given any two parameters of the set {Tc, Δ10, Δ20 > Δ10}, enable one to predict the third. Also given herein are new equations for the critical magnetic field and critical current density of an elemental and a non-elemental SC — equations that are derived directly from those that govern pairing in them. The monograph includes topics that are usually not covered in any one text on superconductivity, e.g., BCS-BEC crossover physics, the long-standing puzzle posed by SrTiO3, and heavy-fermion superconductors — all of which are still imperfectly understood and therefore continue to avidly engage theoreticians. It suggests that addressing the Tcs, Δs and other properties (e.g., number densities of charge carriers) of high-Tc SCs via GBCSEs incorporating chemical potential may lead to tangible clues about raising their Tcs. The final chapter in this monograph deals with solar emission lines and quarkonium spectra because of a feature common between them and superconductivity: existence of a bound state in a medium at finite temperature. This is a problem on which the author has worked for more than 25 years. The treatment in the text is elementary — even those who have only a cursory familiarity with Feynman diagrams should be able to follow it without much difficulty. Contents:The Bethe–Salpeter Equation (BSE)Customization of Bethe–Salpeter Equation (BSE) to SuperconductivityRe-derivation of Some Well-Known Results of BCS Theory via BSE-Based ApproachGeneralized BCS Equations for Superconductors Characterized by High-Tcs and Multiple GapsMulti-Gap Superconductivity: Generalized BCS Equations (GBCSEs) as an Alternative to the Approach Due to Suhl, Matthias, and Walker (SMW)Thermal Conductivity of MgB2Dynamical Equations for Temperature-Dependent Critical Magnetic FieldsDynamical-based Equations for Critical Currents DensitiesBCS-BEC Crossover Physics without Appeal to Scattering Length TheoryOn the Puzzle Posed by Superconducting SrTiO3Some Exceptional Superconductors: La2CuO4 (LCO) and Heavy-fermion Superconductors (HFSCs)Solar Emission Lines and Quarkonium Mass Spectra Readership: Graduate students and researchers in condensed matter physics and low-temperature physics. Keywords:Bethe-Salpeter Equation;Matsubara Prescription;Superpropagator;Propagator Representing Exchanges of More Than One Species of Phonons Responsible for the Formation of Cooper Pairs;Generalized BCS Equations;Mean-Field Approximation;One-, Two-Phonon Exchange Mechanism for Pairing;High-Tc Superconductors;Thermal Conductivity of MgB2;Dynamical Equations for Critical Magnetic Field and Critical Current Density of both Elemental and Composite Superconductors;BCS-BEC Crossover Physics without Appeal to Scattering Length Theory;The Puzzle Posed by SrTiO3;Study of La2CuO4 via Equations Incorporating Chemical Potential;Heavy-Fermion Superconductors

50 Years Of Anderson Localization

Author: Elihu Abrahams
Publisher: World Scientific
ISBN: 9814299073
Size: 68.39 MB
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This unique volume celebrates the five decades of the impact of Anderson localization on modern physics. In addition to the historical perspective on its origin, it provides a comprehensive description of the experimental and theoretical aspects of Anderson localization.

Theory Of Unconventional Superconductors

Author: Dirk Manske
Publisher: Springer Science & Business Media
ISBN: 9783540212294
Size: 48.43 MB
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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.

Exploring The Quantum

Author: Serge Haroche
Publisher: Oxford University Press
ISBN: 0198509146
Size: 51.65 MB
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The quantum world obeys logic at odds with our common sense intuition. This weirdness is directly displayed in recent experiments juggling with isolated atoms and photons. They are reviewed in this book, combining theoretical insight and experimental description, and providing useful illustrations for learning and teaching of quantum mechanics.

The Alchemy Key

Author: Stuart Nettleton
Publisher: Createspace Independent Publishing Platform
ISBN: 9781530080496
Size: 37.74 MB
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The Alchemy Key

Physics Of Negative Refraction And Negative Index Materials

Author: Clifford M. Krowne
Publisher: Springer Science & Business Media
ISBN: 3540721320
Size: 32.21 MB
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This book deals with the subject of optical and electronic negative refraction (NR) and negative index materials NIM). Diverse approaches for achieving NR and NIM are covered, such as using photonic crystals, phononic crystals, split-ring resonators (SRRs) and continuous media, focusing of waves, guided-wave behavior, and nonlinear effects. It is perhaps the most comprehensive book on the new class of negative refraction materials, covering all aspects of negative refraction and negative index materials.

History Of Artificial Cold Scientific Technological And Cultural Issues

Author: Kostas Gavroglu
Publisher: Springer Science & Business Media
ISBN: 9400771991
Size: 19.66 MB
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The history of artificial cold has been a rather intriguing interdisciplinary subject (physics, chemistry, technology, sociology, economics, anthropology, consumer studies) which despite some excellent monographs and research papers, has not been systematically exploited. It is a subject with all kinds of scientific, technological as well as cultural dimensions. For example, the common home refrigerator has brought about unimaginably deep changes to our everyday lives changing drastically eating habits and shopping mentalities. From the end of the 19th century to the beginning of the 21st, issues related to the production and exploitation of artificial cold have never stopped to provide us with an incredibly interesting set of phenomena, novel theoretical explanations, amazing possibilities concerning technological applications and all encompassing cultural repercussions. The discovery of the unexpected and “bizarre” phenomena of superconductivity and superfluidity, the necessity to incorporate macroscopic quantum phenomena to the framework of quantum mechanics, the discovery of Bose-Einstein condensation and high temperature superconductivity, the use of superconducting magnets for high energy particle accelerators, the construction of new computer hardware, the extensive applications of cryomedicine, and the multi billion industry of frozen foods, are some of the more dramatic instances in the history of artificial cold. ​

New Research On Superconductivity

Author: Barry P. Martins
Publisher: Nova Publishers
ISBN: 9781594541971
Size: 33.61 MB
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Superconductivity is the ability of certain materials to conduct electrical current with no resistance and extremely low losses. High temperature superconductors, such as La2-xSrxCuOx (Tc=40K) and YBa2Cu3O7-x (Tc=90K), were discovered in 1987 and have been actively studied since. In spite of an intense, world-wide, research effort during this time, a complete understanding of the copper oxide (cuprate) materials is still lacking. Many fundamental questions are unanswered, particularly the mechanism by which high-Tc superconductivity occurs. More broadly, the cuprates are in a class of solids with strong electron-electron interactions. An understanding of such "strongly correlated" solids is perhaps the major unsolved problem of condensed matter physics with over ten thousand researchers working on this topic. High-Tc superconductors also have significant potential for applications in technologies ranging from electric power generation and transmission to digital electronics. This ability to carry large amounts of current can be applied to electric power devices such as motors and generators, and to electricity transmission in power lines. For example, superconductors can carry as much as 100 times the amount of electricity of ordinary copper or aluminium wires of the same size. Many universities, research institutes and companies are working to develop high-Tc superconductivity applications and considerable progress has been made. This volume brings together new leading-edge research in the field.

An Introduction To The Theory Of Superfluidity

Author: Isaac M. Khalatnikov
Publisher: CRC Press
ISBN: 0429982526
Size: 10.79 MB
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A classic from 1965, this book covers the main aspects of the theory of quantum liquids, including the elementary excitation spectrum, hydrodynamics, and kinetic phenomena. The book requires no special training and assumes only general knowledge of the fundamentals of theoretical physics. It was developed from studies at the Institute of Physical Problems of the U.S.S.R. Academy of Sciences and can be used as a guide for professors teaching quantum liquid theory or as a text for graduate students.