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Critical Fields of mesoscopic superconductors | | Robert Benoist
; Wilhelm Zwerger
; | | Date: |
21 Nov 1996 | | Subject: | Superconductivity | cond-mat.supr-con | | 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 $H_{c3}$. | | Source: | arXiv, cond-mat/9611158 | | Services: | Forum | Review | PDF | Favorites | |
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