Energy band overlapping in high-T-c superconductors
Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T-c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is developed. Values of the overlapped occupancy parameters for typical cuprate su...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1996 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/3379 |
| Acceso en línea: | http://hdl.handle.net/11154/3379 |
| Access Level: | acceso abierto |
| Palabra clave: | Physics, Applied Physics, Condensed Matter Physics, Mathematical |
| Sumario: | Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T-c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is developed. Values of the overlapped occupancy parameters for typical cuprate superconductors are obtained as a function of the ratio R and the effective coupling constant, lambda, in the weak-coupling limit. The overlap scale is of the order or lower than the cutoff (Debye) energy. The typical behavior of the isotope effect is obtained. As these superconductors have transition temperatures above the phonon barrier, the results of this approach are important to the generic understanding of the high-T-c superconducting mechanism. |
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