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VOLUME 83 | ISSUE 5 | PAGE 251
Universal temperature dependence of the conductivity of a strongly disordered granular metal
A. R. Akhmerov, A. S. Ioselevich
L.D. Landau Institute for Theoretical Physics, 119334 Moscow, Russia

PACS: 72.80.Tm, 73.50.-h, 73.63.-b
A disordered array of metal grains with large and random intergrain conductances is studied within the one-loop accuracy renormalization group approach. While at low level of disorder the dependence of conductivity on \log T is nonuniversal (it depends on details of the array's geometry), for strong disorder this dependence is described by a universal nonlinear function, which depends only on the array's dimensionality. In two dimensions this function is found numerically. The dimensional crossover in granular films is discussed.

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