Mesoscopic conductance fluctuations in YBa$_2$Cu$_3$O$_{7-δ}$ grain boundary Junction at low temperature

Details Mesoscopic conductance fluctuations in YBa$_2$Cu$_3$O$_{7-δ}$ grain boundary Junction at low temperature Mesoscopic conductance fluctuations in YBa$_2$Cu$_3$O$_{7-δ}$ grain boundary Junction at low temperature

2009-01-12

arxiv.org/abs/0901.1550v1

Phys. Rev. B 79, 024501 (2009)

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures, accepted with minor changes in Phys.Rev. B

Scientific paper

10.1103/PhysRevB.79.024501

The magneto-conductance in YBCO grain boundary Josephson junctions, displays fluctuations at low temperatures of mesoscopic origin. The morphology of the junction suggests that transport occurs in narrow channels across the grain boundary line, with a large Thouless energy. Nevertheless the measured fluctuation amplitude decreases quite slowly when increasing the voltage up to values about twenty times the Thouless energy, of the order of the nominal superconducting gap. Our findings show the coexistence of supercurrent and quasiparticle current in the junction conduction even at high nonequilibrium conditions. Model calculations confirm the reduced role of quasiparticle relaxation at temperatures up to 3 Kelvin.

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