Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-09-03
Europhys. Lett., 59, pp. 114-120 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 pages, a mistake is corrected and several formulae added
Scientific paper
10.1209/epl/i2002-00166-9
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.
Efetov Konstantin B.
Tschersich A.
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