Abstract
Recent measurements have shown oscillations in the upper critical field of simply connected mesoscopic superconductors. A quantitative theory of these effects is given here on the basis of a Ginzburg-Landau description. For small fields, the H − T phase boundary exhibits a cusp where the screening currents change sign for the first time thus defining a lower critical field H c1. In the limit where many flux quanta are threading the sample, nucleation occurs at the boundary and the upper critical field becomes identical with the surface critical field H c3.
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Dedicated to Prof. W. Götze on the occasion of his 60th birthday
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Benoist, R., Zwerger, W. Critical fields of mesoscopic superconductors. Z. Phys. B 103, 377–381 (1997). https://doi.org/10.1007/s002570050391
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DOI: https://doi.org/10.1007/s002570050391