Magnetofluctuations of the normal-state resistance RN have been reproducibly observed in high-critical- temperature superconductor ?HTS? grain boundary junctions at low temperatures. We attribute them to meso- scopic transport in narrow channels across the grain boundary line. The Thouless energy appears to be the relevant energy scale. Our findings have significant implications for quasiparticle relaxation and coherent transport in HTS grain boundaries.
Observation of mesoscopic conductance fluctuations in YBa2Cu3O7-delta grain boundary Josephson junctions
Tagliacozzo A;Tafuri F
2007
Abstract
Magnetofluctuations of the normal-state resistance RN have been reproducibly observed in high-critical- temperature superconductor ?HTS? grain boundary junctions at low temperatures. We attribute them to meso- scopic transport in narrow channels across the grain boundary line. The Thouless energy appears to be the relevant energy scale. Our findings have significant implications for quasiparticle relaxation and coherent transport in HTS grain boundaries.File in questo prodotto:
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