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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)