Volume 69, Number 3, February 2005
|Page(s)||435 - 441|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||24 December 2004|
Thermal transport in granular metals
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
2 Laboratoire de Physique et Modélisation des Milieux Condensés CNRS and Université Joseph Fourier - BP 166, 38042 Grenoble-cedex 9, France
3 NEST-INFM and Scuola Normale Superiore - I-56126 Pisa, Italy
Accepted: 19 November 2004
We study the electron thermal transport in granular metals at large tunnel conductance between the grains, , and not too low a temperature, , 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.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 73.22.Lp – Collective excitations / 72.15.Jf – Thermoelectric and thermomagnetic effects
© EDP Sciences, 2005
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