Observation of mesoscopic conductance fluctuations in YBaCuO grain boundary Josephson Junctions

Abstract

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.

Revised version, minor changes. 4 pages, 4 figures

References in corpus (7)

• The Josephson critical current in a long mesoscopic S-N-S junction
• Diffusion of Nonequilibrium Quasiparticles in a Cuprate Superconductor
• Supercurrent-carrying density of states in diffusive mesoscopic Josephson weak links
• Relaxation of Hot Quasiparticles in a d-Wave Superconductor
• Conductance Fluctuations in a Metallic Wire Interrupted by a Tunnel Junction
• Nonequilibrium mesoscopic conductance fluctuations
• Conductance fluctuations at the quantum Hall plateau transition

Cited by in corpus (1)

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