We have measured the third derivative of the current-voltage characteristics, d^3I/dV^3, in a two-dimensional array of small tunnel junctions using a lock-in amplifier. We show that this derivative is zero at a voltage which scales linearly with the temperature and depends only on the temperature and natural constants, thus providing a primary thermometer. We demonstrate a measurement method which extracts the zero crossing voltage directly using a feedback circuit. This method requires only one voltage measurement, which makes it substantially faster than the original Coulomb blockade thermometry method.
Cite
@article{arxiv.cond-mat/0012242,
title = {A fast, primary Coulomb blockade thermometer},
author = {Tobias Bergsten and Tord Claeson and Per Delsing},
journal= {arXiv preprint arXiv:cond-mat/0012242},
year = {2009}
}
Comments
3 pages, 4 figures. This article has been submitted to Applied Physics Letters (http://ojps.aip.org/aplo)