Mechanisms of heat conductivity in high-{ital T}{sub {ital c}} superconductors
Journal Article
·
· Physical Review, B: Condensed Matter
- Departamento de Fisica de la Materia Condensada, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain)
A phenomenological approach to the heat conductivity {kappa} in the mixed state of a high-{ital T}{sub {ital c}} superconductor is proposed, which permits resolution between the electronic and phononic contributions, {kappa}{sub el} and {kappa}{sub ph}. The scattering amplitude for bandlike quasiparticles vs bound states in the vortex cores has been microscopically estimated. The measurements of the in-plane thermal conductivity {kappa}({ital B},{ital T}) of single crystals YBa{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} have been performed at several temperatures {ital T} from 4 to 110 K and magnetic fields {ital B} (along the {ital c} axis) up to 11 T. From comparison of experimental data with the phenomenologic model, the ratio {kappa}{sub el}/{kappa}{sub ph} (at {ital B}=0) has been extracted. This analysis shows that only {kappa}{sub el} is field sensitive and it is mostly responsible for the maximum of {kappa} vs {ital T}, observed at {ital B}=0 in both materials.
- OSTI ID:
- 54950
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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