Observation of mesoscopic conductance fluctuations in YBaCuO grain boundary Josephson Junctions

Details Observation of mesoscopic conductance fluctuations in YBaCuO grain boundary Josephson Junctions Observation of mesoscopic conductance fluctuations in YBaCuO grain boundary Josephson Junctions

2006-05-24

arxiv.org/abs/cond-mat/0605596v2

Physics

Condensed Matter

Superconductivity

Revised version, minor changes. 4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.75.012507

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.

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