Thermal transport in granular metals
نویسندگان
چکیده
– We study the electron thermal transport in granular metals at large tunnel conductance between the grains, gT 1, and not too low a temperature, T > gTδ, where δ is the mean energy level spacing for a single grain. Taking into account the electron-electron interaction effects, we calculate the thermal conductivity and show that the Wiedemann-Franz law is violated for granular metals. We find that interaction effects suppress the thermal conductivity less than the electrical conductivity. The electrical conductivity σ and the thermal conductivity κ of an ordinary metal are related to each other via a universal relation [1] known as the Wiedemann-Franz law:
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