Thermal-noise-induced resistance and supercurrent correlation function in YBa2Cu3O7−δ grain-boundary Josephson junctions

S. Schuster; R. Gross; B. Mayer; R. P. Huebener

doi:10.1103/PhysRevB.48.16172

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Thermal-noise-induced resistance and supercurrent correlation function in YBa2Cu3O7−δ grain-boundary Josephson junctions

S. Schuster, R. Gross, B. Mayer, R. P. Huebener

DOI 10.1103/PhysRevB.48.16172 · Physical Review B

T1

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Abstract

Thermal noise is known to cause a finite resistance Rp of overdamped Josephson junctions even in the zero-current limit. By extending the treatment of Ambegaokar and Halperin the magnetic-field dependence of this resistance is analyzed for arbitrary current-phase relations. We show that the measurement of the magnetic-field dependence of Rp allows the determination of the magnetic-field dependence of the critical current in the temperature regime where thermal-noise rounding effects prevent the application of the usual methods. Applying this technique the correlation function of the supercurrent distribution of YBa2Cu3O7−δ grain-boundary junctions could be determined with a spatial resolution of 130 nm. The correlation function indicates that the supercurrent distribution along the grain boundary is spatially nonuniform on a sub-μm scale.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown