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19 April 2024

» arxiv » cond-mat/0103202

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Measurements of the Complex Conductivity of NbxSi1-x Alloys on the Insulating Side of the Metal-Insulator Transition
Erik Helgren ; George Grüner ; Martin Ciofalo ; David V. Baxter ; John P. Carini ;
Date:	8 Mar 2001
Journal:	Phys. Rev. Lett. 87, 116602 (2001)
Subject:	Strongly Correlated Electrons; Disordered Systems and Neural Networks \| cond-mat.str-el cond-mat.dis-nn
Affiliation:	UCLA), Martin Ciofalo, David V. Baxter, and John P. Carini (Indiana U
Abstract:	We have conducted temperature and frequency dependent transport measurements in amorphous Nb_x Si_{1-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 $sigma(omega) propto (-imath omega)^alpha$ with the exponent somewhat smaller than one. Our ac results are not consistent with extant theories for the hopping transport.
Source:	arXiv, cond-mat/0103202
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