S. Fujita, S. Godoy

Theory of High Temperature Superconductivity

• Gebundenes Buch

Produktbeschreibung

Flux quantization experiments indicate that the carriers, Cooper pairs (pairons), in the supercurrent have charge magnitude 2e, and that they move independently. Josephson interference in a Superconducting Quantum Int- ference Device (SQUID) shows that the centers of masses (CM) of pairons move as bosons with a linear dispersion relation. Based on this evidence we develop a theory of superconductivity in conventional and mate- als from a unified point of view. Following Bardeen, Cooper and Schrieffer (BCS) we regard the phonon exchange attraction as the cause of superc- ductivity. For cuprate superconductors, however, we take account of both optical- and acoustic-phonon exchange. BCS started with a Hamiltonian containing "electron" and "hole" kinetic energies and a pairing interaction with the phonon variables eliminated. These "electrons" and "holes" were introduced formally in terms of a free-electron model, which we consider unsatisfactory. We define "electrons" and "holes" interms of the cur- tures of the Fermi surface. "Electrons" (1) and "holes" (2) are different and so they are assigned with different effective masses: Blatt, Schafroth and Butler proposed to explain superconductivity in terms of a Bose-Einstein Condensation (BEC) of electron pairs, each having mass M and a size. The system of free massive bosons, having a quadratic dispersion relation: and moving in three dimensions (3D) undergoes a BEC transition at where is the pair density.

Produktdetails

• Fundamental Theories of Physics 121
• Verlag: Springer / Springer Netherlands
• Artikelnr. des Verlages: 978-1-4020-0149-9
• 2001
• Seitenzahl: 404
• Erscheinungstermin: 31. Dezember 2001
• Englisch
• Abmessung: 241mm x 160mm x 27mm
• Gewicht: 744g
• ISBN-13: 9781402001499
• ISBN-10: 1402001495
• Artikelnr.: 22007720

Inhaltsangabe

Superconducting Transition.- Bloch Electrons.- Phonon-Exchange Attraction.- Quantum Statistical Theory.- Cooper Pairs (Pairons).- Superconductors at 0 K.- Quantum Statistics of Composites.- Bose-Einstein Condensation.- The Energy Gap Equations.- Pairon Energy Gaps. Heat Capacity.- Quantum Tunneling.- Flux Quantization.- Ginzburg-Landau Theory.- Josephson Effects.- Compound Superconductors.- Lattice Structures of Cuprates.- High-Tc Superconductors Below Tc.- Doping Dependence of Tc.- Transport Properties Above Tc.- Out-of-Plane Transport.- Seebeck Coefficient (Thermopower).- Magnetic Susceptibility.- Infrared Hall Effect.- d-Wave Cooper Pairs.- Connection with Other Theories.- Summary and Remarks.