Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals

Abstract

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.

arXiv comment9 pages, 7 figures. Replaced with published version. Important changes

References in corpus (12)

• Hamiltonian approach to the transport properties of superconducting quantum point contacts
• Gaussian superconducting fluctuations, thermal transport, and the Nernst effect
• Mesoscopic charge quantization
• Inelastic Electron Lifetime in Disordered Mesoscopic Systems
• Quantum interference and Coulomb interaction in arrays of tunnel junctions
• Magnetoresistance of Granular Superconducting Metals in a Strong Magnetic Field
• Superconducting fluctuations and the Nernst effect: A diagrammatic approach
• Absence of singular superconducting fluctuation corrections to thermal conductivity
• Effects of fluctuations and Coulomb interaction on the transition temperature of granular superconductors
• Weak localization effects in granular metals
• The Fluctuation Induced Pseudogap in the Infrared Optical Conductivity of High Temperature Superconductors
• Granulated superconductors:from the nonlinear sigma model to the Bose-Hubbard description

Cited by in corpus (2)

• Granular Electronic Systems
• Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific work