Excess resistance in the superconducting transition of a mesoscopic Al disk |
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Authors: | K Enomoto T Yamaguchi T Yakabe T Terashima T Konoike M Nishimura S Uji |
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Institution: | National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan |
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Abstract: | We report resistance measurements on a mesoscopic Al disk whose size is comparable to the superconducting coherence length. As the magnetic field increases, resistance peaks successively appear and some of the peak resistances are larger than the normal state value RN. These peaks are ascribed to the transitions between different vortex states in the superconducting Al disk. The experimental results suggest that some anomalous energy dissipation is caused by the dynamics of the vortices in the confined geometry. |
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Keywords: | Superconducting nanostructures Excess resistance Vortex states |
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