Buch, Englisch, Band 121, 374 Seiten, Format (B × H): 160 mm x 241 mm, Gewicht: 1640 g
Buch, Englisch, Band 121, 374 Seiten, Format (B × H): 160 mm x 241 mm, Gewicht: 1640 g
Reihe: Fundamental Theories of Physics
ISBN: 978-1-4020-0149-9
Verlag: Springer Netherlands
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” in terms 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.
Zielgruppe
Research
Autoren/Hrsg.
Fachgebiete
- Naturwissenschaften Physik Angewandte Physik Statistische Physik, Dynamische Systeme
- Naturwissenschaften Physik Elektromagnetismus Magnetismus
- Naturwissenschaften Physik Quantenphysik Atom- und Molekülphysik
- Naturwissenschaften Physik Thermodynamik Festkörperphysik, Kondensierte Materie
- Naturwissenschaften Chemie Physikalische Chemie
- Naturwissenschaften Physik Elektromagnetismus Elektrizität, Elektrodynamik
- Naturwissenschaften Physik Elektromagnetismus Halbleiter- und Supraleiterphysik
Weitere Infos & Material
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.
