Variable range cotunneling and conductivity of a granular metal

Details Variable range cotunneling and conductivity of a granular metal Variable range cotunneling and conductivity of a granular metal

2005-02-19

arxiv.org/abs/cond-mat/0502481v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to JETP Letters

Scientific paper

10.1134/1.1931015

The Efros-Shklovskii 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 T << T_c, while it is inelastic (i.e., accompanied by creation of electron-hole pairs on a string of intermediate non-resonant grains) at T > T_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 T much below T_c, while at T>T_c it is suppressed due to inelastic processes which destroy the interference.

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