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arXiv · 1002.0983

Charge imbalance in superconductors in the low-temperature limit

F. Hübler·J. Camirand Lemyre·D. Beckmann·H. v. Löhneysen
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Abstract

We explore charge imbalance in mesoscopic normal-metal/superconductor multiterminal structures at very low temperatures. The investigated samples, fabricated by e-beam lithography and shadow evaporation, consist of a superconducting aluminum bar with several copper wires forming tunnel contacts at different distances from each other. We have measured in detail the local and non-local conductance of these structures as a function of the applied bias voltage V, the applied magnetic field B, the temperature T and the contact distance d. From these data the charge-imbalance relaxation length lambda_Q* is derived. The bias-resolved measurements show a transition from dominant elastic scattering close to the energy gap to an inelastic two-stage relaxation at higher bias. We observe a strong suppression of charge imbalance with magnetic field, which can be directly linked to the pair-breaking parameter. In contrast, practically no temperature dependence of the charge-imbalance signal was observed below 0.5 K. These results are relevant for the investigation of other non-local effects such as crossed Andreev reflexion and spin diffusion.

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F. Hübler, J. Camirand Lemyre, D. Beckmann, H. v. Löhneysen. 2010-02-04. Charge imbalance in superconductors in the low-temperature limit. https://doi.org/10.1103/physrevb.81.184524

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