Asymmetric current-voltage characteristics in type-II superconductors

Xiuguang Jiang; P. J. Connolly; S. J. Hagen; C. J. Lobb

doi:10.1103/PhysRevB.49.9244

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Asymmetric current-voltage characteristics in type-II superconductors

Xiuguang Jiang, P. J. Connolly, S. J. Hagen, C. J. Lobb

DOI 10.1103/PhysRevB.49.9244 · Physical Review B

T1

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Abstract

We report asymmetric current-voltage characteristics in superconducting films in a parallel magnetic field. The critical current, Ic, is found to differ by as much as 30% for negative and positive currents, and beyond Ic, the magnitude of the voltage is also different for positive and negative currents, ‖V(+I)‖≠‖V(-I)‖. The critical current difference ‖Ic+‖-‖Ic−‖ has complicated behavior, changing sign as temperature and magnetic field are varied. We propose a model based on the Bean-Livingston surface barrier and inhomogeneous bulk pinning that accounts for all observed behavior.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.7	Pressure not reported	unknown
Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown