Magneto-fluctuations of the normal resistance R_N have been reproducibly observed in high critical temp erature superconductor (HTS) grain boundary junctions, at low temperatures. We attribute them to mesoscopic transport in narrow channels across the grain boundary line. The Thouless energy appears to be the relevant energy scale. Our findings have significant implications on quasiparticle relaxation and coherent transport in HTS grain boundaries.
@article{arxiv.cond-mat/0605596,
title = {Observation of mesoscopic conductance fluctuations in YBaCuO grain boundary Josephson Junctions},
author = {A. Tagliacozzo and D. Born and D. Stornaiuolo and E. Gambale and D. Dalena and F. Lombardi and A. Barone and B. L. Altshuler and F. Tafuri},
journal= {arXiv preprint arXiv:cond-mat/0605596},
year = {2009}
}
Comments
Revised version, minor changes. 4 pages, 4 figures