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Superconductivity

Author: G P Malik
Publisher: World Scientific
ISBN: 9814733091
Size: 70.41 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

Quantenfeldtheorie Des Festk Rpers

Author: H. Haken
Publisher: Springer-Verlag
ISBN: 3322966941
Size: 49.93 MB
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Die Festkörperphysik ist eines der großen Hauptgebiete der heutigen Physik. Der Festkörper stellt mit seinen verwickelten elektrischen, optischen, thermischen und magnetischen Eigenschaften ein äußerst reizvolles Objekt moderner Grundlagen forschung dar. In der Tat gelingt es hier, die oft sehr komplizierten Erscheinungen aufzuklären und bis in die Details hinein zu verfolgen. Das damit verbundene tief greifende Verständnis der physikalischen Vorgänge im Festkörper führt darüber hinaus zu äußerst wichtigen Anwendungen, z. B. in der Nachrichten-und Computer technik. Der Studierende, der sich in dieses Gebiet einarbeiten will, stellt allerdings sehr rasch fest, daß hier in großem Umfang Begriffsbildungen und Methoden der Quantenfeld theorie verwendet werden. Diese Methoden gestatten es nicht nur, die physikalischen Vorgänge im Festkörper in eleganter Weise zu beschreiben, sondern sie haben auch zu grundsätzlich neuen Erkenntnissen geführt. Als hervorragendes Beispiel sei hier nur die Erklärung der Supraleitung erwähnt. Andererseits wird dem Studierenden in einer Kursvorlesung, etwa der Quanten mechanik, kaum die Möglichkeit geboten, dieses wichtige Gebiet kennenzulernen. Aufgabe dieses Buches soll es sein, diese Lücke zu schließen, indem es den Leser in einfacher Weise an die Begriffsbildungen und Methoden der Quantenfeldtheorie her anführt. So sollte ein Leser, der mit den mathematischen Kenntnissen der ersten drei Semes·ter und den Grundbegriffen der Quantenmechanik vertraut ist, ohne weiteres in der Lage sein, sich mit Hilfe dieses Buches in die Quantenfeldtheorie des Fest körpers einzuarbeiten.

Supraleitung Suprafluidit T Und Kondensate

Author: James F Annett
Publisher: Oldenbourg Verlag
ISBN: 3486705407
Size: 28.53 MB
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Das Buch behandelt drei physikalische Phänomene: die Bose-Einstein-Kondensation, Suprafluidität und Supraleitung, wobei es in die wesentlichen Konzepte und notwendigen mathematischen Formalismen schrittweise einführt.

Corporate Policy And Governance

Author: Fredmund Malik
Publisher: Campus Verlag
ISBN: 3593419483
Size: 38.16 MB
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"Fredmund Malik has become the leading analyst of, and expert on Management in Europe (...). He is a commanding figure - in theory as well as in the practice of Management." Peter Drucker Man-made organizations such as businesses and other societal institutions can function autodynamically, in the same way as modern technology steers, regulates and controls itself. With this book, Fredmund Malik offers insight into his cybernetic toolkit, along with instructions for its use. General systems policy and master controls are the key functions of future corporate policy and corporate governance. Fredmund Malik shows how organizations have to be organized so they can subsequently organize themselves. With this book series he presents his cybernetic general management system for the age of complexity. "With this book, Malik lives up to his reputation as a mastermind." Financial Times Deutschland

Grundkurs Theoretische Physik 7

Author: Wolfgang Nolting
Publisher: Springer-Verlag
ISBN: 3642258085
Size: 51.45 MB
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Der Grundkurs Theoretische Physik deckt in 7 Bänden alle für das Diplom und für Bachelor/Master-Studiengänge maßgeblichen Gebiete ab. Jeder Band vermittelt das im jeweiligen Semester notwendige theoretisch-physikalische Rüstzeug. Übungsaufgaben mit ausführlichen Lösungen dienen der Vertiefung des Stoffs. Die grundlegend überarbeitete Neuauflage des 7. Bandes wurde um weitere Aufgaben sowie Abschnitte zur Hochenergiephysik ergänzt. Mit der zweifarbigen Darstellung ist der Lehrstoff nun noch übersichtlicher gegliedert.