We have fabricated superconducting connecting necks of Pb with a scanning tunneling microscope (STM) and studied their properties under magnetic fields near the transition to the resistive state. A striking phenomenology is found with two well defined conduction regimes as a function of the magnetic field. We discuss the possible origin of this behavior in terms of the interplay between the field dependence of the quasiparticle charge imbalance length ΛQ∗ and the length of the neck which is superconducting under field.
@article{arxiv.cond-mat/0009127,
title = {Nonequilibrium effects in superconducting necks of nanoscopic dimensions},
author = {H. Suderow and S. Vieira},
journal= {arXiv preprint arXiv:cond-mat/0009127},
year = {2009}
}
Comments
11 pages, 3 figures; to be published in Physics Letters A