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1. Measurements of the complex conductivity of NbxSi(1-x) alloys on the insulating side of the metal-insulator transition

Author

E, Helgren, G, Grüner, M R, Ciofalo, D V, Baxter, and J P, Carini

Abstract

We have conducted temperature and frequency dependent transport measurements in amorphous NbxSi1-x samples in the insulating regime. We find a temperature dependent dc conductivity consistent with variable range hopping in a Coulomb glass. The frequency dependent response in the millimeter-wave frequency range can be described by the expression sigma(omega) varies with (-iota omega)(alpha) with the exponent somewhat smaller than 1. Our ac results are not consistent with extant theories for the hopping transport.

Published
2001

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