EPL

Issue		Europhys. Lett. Volume 69, Number 3, February 2005
Page(s)		435 - 441
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		10.1209/epl/i2004-10355-6
Published online		24 December 2004

Europhys. Lett., 69 (3), pp. 435-441 (2005)
DOI: 10.1209/epl/i2004-10355-6

Thermal transport in granular metals

I. S. Beloborodov¹, A. V. Lopatin¹, F. W. J. Hekking², Rosario Fazio³ and V. M. Vinokur¹

¹ 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

received 27 August 2004; accepted in final form 19 November 2004
published online 24 December 2004

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