Variable-range cotunneling and conductivity of a granular metal

  • M. V. Feigel’man
  • A. S. Ioselevich
Condensed Matter


The Efros-Shklovskii (E-S) law for the conductivity of granular metals is interpreted as a result of a variable-range cotunneling process. The cotunneling between distant resonant grains is predominantly elastic at low TT c , while it is inelastic (i.e., accompanied by creation of electron-hole pairs on a string of intermediate non-resonant grains) at TT c . The corresponding E-S temperature T ES , in the latter case, is slightly (logarithmically) T dependent. The magnetoresistance in the two cases is different: it may be relatively strong and negative at TT c , while, at T > T c , it is suppressed due to inelastic processes, which destroy the interference.

PACS numbers

73.23.Hk 73.43.Qt 73.63.−b 


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Copyright information

© Pleiades Publishing, Inc. 2005

Authors and Affiliations

  • M. V. Feigel’man
    • 1
  • A. S. Ioselevich
    • 1
  1. 1.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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