Thermal transport in granular metals

We study the electron thermal transport in granular metals at large tunnel conductance between the grains, $g_{\ab{T}}\gg 1$, and not too low a temperature, $T>g_{\ab{T}}\delta$, 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