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Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 4: Nanostructured Materials I

MM 4.5: Talk

Monday, February 25, 2008, 11:15–11:30, H 0107

Observation of coherent electron motion in disordered granular metals — •Michael Huth, Dirk Klingenberger, and Christina Grimm — Physikalisches Institut, Goethe-Universität, D-60438 Frankfurt am Main, Germany

We observed a σ ∝ √T-dependence of the electrical conductivity σ vs. temperature T in metal-insulator nanocomposite samples prepared by electron beam induced deposition. This dependence was recently predicted as a low-energy contribution in the metallic regime of 3D granular metals if electron-electron interactions are taken into account1. It is the consequence of the occurence of a large-scale coherent electron motion and signifies a universal resistive behavior in granular metals even in the presence of disorder.

1I. S. Beloborodov, K. B. Efetov, A. V. Lopatin, and V. M. Vinokur, Phys. Rev. Lett. 91, 246801 (2003); I. S. Beloborodov, A. V. Lopatin, V. M. Vinokur, and K. B. Efetov, Rev. Mod. Phys. 79, 469 (2007)

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