| Issue |
Europhys. Lett.
Volume 59, Number 1, July 2002
|
|
|---|---|---|
| Page(s) | 100 - 106 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00164-y | |
| Published online | 01 June 2002 | |
Scaling of the conductivity of insulating 
:
A temperature-independent hopping prefactor
Physics Department, City College of the City University of
New York New York, NY 10031, USA
Corresponding author: peterd@oplink.com
Received:
7
January
2002
Accepted:
11
April
2002
For insulating with dopant concentrations from 
to
the critical concentration nc, the conductivity ranging over five orders of
magnitude collapses using a single scaling parameter T* onto a
universal curve of the form 
with a
prefactor 
that is independent of temperature and
dopant concentration. The function 
with
when 
, corresponding to Efros-Shklovskii variable-range
hopping. For
the exponent 
, a value expected for Mott
variable-range hopping in two rather than three dimensions.
PACS: 72.20.Ee – Mobility edges; hopping transport
© EDP Sciences, 2002
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