Charge-imbalance effects in intrinsic Josephson systems

Details Charge-imbalance effects in intrinsic Josephson systems Charge-imbalance effects in intrinsic Josephson systems

2002-07-26

arxiv.org/abs/cond-mat/0207634v1

Physics

Condensed Matter

Superconductivity

8pages, 9figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.024510

We report on two types of experiments with intrinsic Josephson systems made from layered superconductors which show clear evidence of nonequilibrium effects: 1. In 2-point measurements of IV-curves in the presence of high- frequency radiation a shift of the voltage of Shapiro steps from the canonical value hf/(2e) has been observed. 2. In the IV-curves of double-mesa structures an influence of the current through one mesa on the voltage measured on the other mesa is detected. Both effects can be explained by charge-imbalance on the superconducting layers produced by the quasi-particle current, and can be described successfully by a recently developed theory of nonequilibrium effects in intrinsic Josephson systems.

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