Charge imbalance in superconductors in the low-temperature limit
| Autor: | Hübler, F., Lemyre, J. Camirand, Beckmann, D., Löhneysen, H. v. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 81, 184524 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.81.184524 |
| Popis: | 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. Comment: 9 pages, 9 figures, RevTeX |
| Databáze: | arXiv |
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