Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals

Details Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals

2005-03-09

arxiv.org/abs/cond-mat/0503218v2

Phys. Rev. B 72, 134510 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures. Replaced with published version. Important changes

Scientific paper

10.1103/PhysRevB.72.134510

The first-order superconducting fluctuation corrections to the thermal conductivity of a granular metal are calculated. A suppression of thermal conductivity proportional to $T_c/(T-T_c)$ is observed in a region not too close to the critical temperature $T_c$. As $T\simeq T_c$, a saturation of the correction is found, and its sign depends on the ratio between the barrier transparency and the critical temperature. In both regimes, the Wiedemann-Franz law is violated.

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