| Issue |
Europhys. Lett.
Volume 59, Number 1, July 2002
|
|
|---|---|---|
| Page(s) | 114 - 120 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00166-9 | |
| Published online | 01 June 2002 | |
Transition from insulating to non-insulating temperature dependence of the conductivity in granular metals
1
Theoretische Physik III, Ruhr-Universität Bochum -
44780 Bochum, Germany
2
L. D. Landau Institute for Theoretical Physics - 117940 Moscow,
Russia
Received:
8
April
2002
Accepted:
10
April
2002
We consider interaction effects in a granular normal metal at not very low temperatures. Assuming that all weak localization effects are suppressed by the temperature we replace the initial Hamiltonian by a proper functional of phases and study the possibility for a phase transition depending on the tunneling conductance g. It is demonstrated for any dimension that, while at small g the conductivity decays with temperature exponentially, its temperature dependence is logarithmic at large g. The formulae obtained are compared with an existing experiment and a good agreement is found.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 73.22.Lp – Collective excitations / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, 2002
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