We demonstrate experimentally that disorder enhanced Andreev current in a tunnel junction between a normal metal and a superconductor provides a method to measure electronic temperature, specifically at temperatures below 200 mK when aluminium is used. This Andreev thermometer has some advantages over conventional quasiparticle thermometers: for instance, it does not conduct heat and its reading does not saturate until at lower temperatures. Another merit is that the responsivity is constant over a wide temperature range.
@article{arxiv.1503.03972,
title = {Andreev Current for low temperature thermometry},
author = {T. Faivre and D. S. Golubev and J. P. Pekola},
journal= {arXiv preprint arXiv:1503.03972},
year = {2015}
}