Variable-range cotunneling and conductivity of a granular metal

M. V. Feigel'man, A. S. Ioselevich

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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 T ≤ T c, while it is inelastic (i.e., accompanied by creation of electron-hole pairs on a string of intermediate nonresonant grains) at T ≥ Tc. The corresponding E-S temperature TES, 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 ≪ Tc, while, at T > Tc, it is suppressed due to inelastic processes, which destroy the interference.

Original languageEnglish
Pages (from-to)277-283
Number of pages7
JournalJETP Letters
Issue number6
Publication statusPublished - 2005
Externally publishedYes


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