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Author: G P Malik
Publisher: World Scientific
ISBN: 9814733091
Size: 60.22 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

Quantum Field Theory Of Many Body Systems

Author: Xiao-Gang Wen
Publisher: Oxford University Press on Demand
ISBN: 0198530943
Size: 64.42 MB
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This book is a pedagogical and systematic introduction to new concepts and quantum field theoretical methods in condensed matter physics, which may have an impact on our understanding of the origin of light, electrons and other elementary particles in the universe. Emphasis is on clear physical principles, while at the same time bringing students to the fore of today's research.

Selected Papers Of Abdus Salam

Author: Abdus Salam
Publisher: World Scientific
ISBN: 9789810216634
Size: 32.53 MB
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This is a selection from over 250 papers published by Abdus Salam. Professor Salam has been Professor of Theoretical Physics at Imperial College, London and Director of the International Centre for Theoretical Physics in Trieste, for which he was largely responsible for creating. He is one of the most distinguished theoretical physicists of his generation and won the Nobel Prize for Physics in 1979 for his work on the unification of electromagnetic and weak interactions. He is well known for his deep interest in the development of scientific research in the third world (to which ICTP is devoted) and has taken a leading part in setting up the Third World Academy. His research work has ranged widely over quantum field theory and all aspects of the theory of elementary particles and more recently into other fields, including high-temperature superconductivity and theoretical biology. The papers selected represent a cross section of his work covering the entire period of 50 years from his student days to the present.

Theory Of Unconventional Superconductors

Author: Dirk Manske
Publisher: Springer Science & Business Media
ISBN: 9783540212294
Size: 19.19 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: 17.80 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: 70.84 MB
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The Alchemy Key

High Performance Computing In Science And Engineering 98

Author: Egon Krause
Publisher: Springer Science & Business Media
ISBN: 3642586007
Size: 48.59 MB
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The book contains reports about the most significant projects from science and industry that are using the supercomputers of the Federal High Performance Computing Center Stuttgart (HLRS). These projects are from different scientific disciplines, with a focus on engineering, physics and chemistry. They were carefully selected in a peer-review process and are showcases for an innovative combination of state-of-the-art physical modeling, novel algorithms and the use of leading-edge parallel computer technology. As HLRS is in close cooperation with industrial companies, special emphasis has been put on the industrial relevance of results and methods.

Physics Of Negative Refraction And Negative Index Materials

Author: Clifford M. Krowne
Publisher: Springer Science & Business Media
ISBN: 3540721320
Size: 52.30 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.

New Research On Superconductivity

Author: Barry P. Martins
Publisher: Nova Publishers
ISBN: 9781594541971
Size: 15.39 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.