Thermal conductivity of a granular superconductor
S. Sergeenkov, M. Ausloos
DOI 10.1103/PhysRevB.48.4188 · Physical Review B
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Abstract
The temperature and magnetic-field dependence of the thermal conductivity κ for a granular superconductor is considered via the superconductive glass model. Above the phase-locking temperature Tc (but below the single-grain superconducting temperature Ts) κ is found to be dominated by the Rayleigh-like grain-boundary-scattering mechanism, while below Tc the thermal conductivity follows a glasslike T2 dependence. In the paracoherent state (Ts>T>Tc) the Wiedemann-Franz law appears to be nearly satisfied. The field dependence of κ is shown to be highly sensitive to the form of the grain-distribution function.
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. | — | Pressure not reported | unknown |
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