The first-order superconducting fluctuation corrections to the thermal conductivity of a granular metal are calculated. A suppression of thermal conductivity proportional to Tc/(T−Tc) is observed in a region not too close to the critical temperature Tc. As T≃Tc, 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.
@article{arxiv.cond-mat/0503218,
title = {Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals},
author = {C. Biagini and R. Ferone and Rosario Fazio and F. W. J. Hekking and V. Tognetti},
journal= {arXiv preprint arXiv:cond-mat/0503218},
year = {2009}
}
Comments
9 pages, 7 figures. Replaced with published version. Important changes