Critical fields in inhomogeneous superconductors

✍ Scribed by L. Dobrosavljević; M. Kulić

• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 416 KB
• Volume: 32
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00117967

✦ Synopsis

The nucleation fields in a type H superconducting alloy with periodically modulated concentration are calculated. The transition curve for the bulk nucleation has positive curvature near Tc when the applied field is parallel to the equiconcentration planes, similar to the case of layered superconductors. In both cases the enhancement of the critical field is due to the "matching" of vortices with the periodic structure of the material. The surface nucleation field can be enhanced, diminished, or even suppressed, depending on the inhomogeneity distribution near the surface. The effects of modulation are less in perpendicular field than in the parallel one.