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: email@example.com
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