We have investigated break junctions of normal non-magnetic metals as well as ferromagnets at low temperatures. The point contacts with radii 0.15 - 15 nm showed zero-bias anomalies which can be attributed to Kondo scattering at a single Kondo impurity at the contact or to the switching of a single conducting channel. The Kondo temperatures derived from the width of the anomalies varied between 10 and 1000 K. These results agree well with literature data on atomic-size contacts of the ferromagnets as well as with spear-anvil type contacts on a wide variety of metals.
@article{arxiv.1109.3774,
title = {Break-junction experiments on the zero-bias anomaly of non-magnetic and ferromagnetically ordered metals},
author = {Kurt Gloos and Elina Tuuli},
journal= {arXiv preprint arXiv:1109.3774},
year = {2015}
}
Comments
7 pages, 4 figures, submitted to Proceedings of the 26th Conference on Low Temperature Physics