Abstract
We report the size dependence of superconducting transition in mesoscopic Al disks with 1.0, 0.7, and 0.4μ m in diameter performed by resistance measurements under magnetic field. All the samples show excess resistance peaks near Hc2, which are 3 ∼ 6 times larger than normal state resistance Rn, whereas there are no resistance peaks at H = 0. We find that the resistance peak rapidly increases and becomes the largest at the magnetic field just below the transition of vorticity L : 0 → 1 with no relation to the sample size. The resistance peak, which shows the presence of large energy dissipation, would be caused by characteristic vortex dynamics confined in the small geometries.
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