Mechanisms of heat conductivity in high-Tc superconductors

Yury Pogorelov; Miguel Angel Arranz; Raúl Villar; Sebastián Vieira

doi:10.1103/PhysRevB.51.15474

← Back to search

Mechanisms of heat conductivity in high-Tc superconductors

Yury Pogorelov, Miguel Angel Arranz, Raúl Villar, Sebastián Vieira

DOI 10.1103/PhysRevB.51.15474 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

A phenomenological approach to the heat conductivity κ in the mixed state of a high-Tc superconductor is proposed, which permits resolution between the electronic and phononic contributions, κel and κph. 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 κ(B,T) of single crystals YBa2Cu3O7 and Bi2Sr2CaCu2O8 have been performed at several temperatures T from 4 to 110 K and magnetic fields B (along the c axis) up to 11 T. From comparison of experimental data with the phenomenologic model, the ratio κel/κph (at B=0) has been extracted. This analysis shows that only κel is field sensitive and it is mostly responsible for the maximum of κ vs T, observed at B=0 in both materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	onset
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	onset