The temperature dependence of an integer Quantum Hall effect transition is studied in a sample where the disorder is dominated by short-ranged potential scattering. At low temperatures the results are consistent with a (T/T0)κ scaling behaviour and at higher temperatures by a linear dependence similar to that reported in other material systems. It is shown that the linear behaviour results from thermal broadening produced by the Fermi-Dirac distribution function and that the temperature dependence over the whole range depends only on the scaling parameter T0κ.
@article{arxiv.cond-mat/9903246,
title = {On the thermal broadening of a quantum critical phase transition},
author = {P. T. Coleridge and P. Zawadzki},
journal= {arXiv preprint arXiv:cond-mat/9903246},
year = {2009}
}