Surface superconducting states and paramagnetism in mesoscopic superconductors

Details Surface superconducting states and paramagnetism in mesoscopic superconductors Surface superconducting states and paramagnetism in mesoscopic superconductors

2002-12-19

arxiv.org/abs/cond-mat/0212474v1

Physics

Condensed Matter

Superconductivity

11 pages, 9 figures

Scientific paper

10.1103/PhysRevB.68.104522

In the framework of the Ginzburg-Landau equation, the temperature dependence of the upper critical field of small ring-like superconductors is studied. At equilibrium small parts of the phase diagram show paramagnetism for width / radius ratios below 0.85. Their number and extension increase with the size of the hole. In these regions, only the inner part of the ring shows a positive magnetic moment. The order parameter density profile appears to change, when crossing a first order transition line, which separates different angular momentum values, and we clarify the relationship between the localization of superconductivity nucleation and paramagnetism of those samples.

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