Vortex lines or vortex-line chains at the lower critical field in anisotropic superconductors?

The vortex state at the lower critical field, H c1, in clean anisotropic superconductors placed in an external field tilted with respect to the axis of anisotropy ( c-axis) is considered assuming two possible arrangements: dilute vortex lines or dilute vortex-line chains. By minimizing the Gibbs fre...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2001-01, Vol.349 (3), p.196-200
Main Authors: Morgado, W.A.M, Doria, M.M, Carneiro, G
Format: Article
Language:English
Subjects:
Anisotropy
Flux pinning
Lower critical field Hc1
Vortex lines
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Summary:The vortex state at the lower critical field, H c1, in clean anisotropic superconductors placed in an external field tilted with respect to the axis of anisotropy ( c-axis) is considered assuming two possible arrangements: dilute vortex lines or dilute vortex-line chains. By minimizing the Gibbs free energies in the London limit for each possibility, we obtain the corresponding lower critical fields as a function of the tilt angle. The equilibrium configuration at H c1 for a given tilt angle is identified with that for which H c1 is the smallest. We report results for parameter values typical of strong and moderate anisotropy. We find that for strong anisotropy, vortex-line chains are favored for small tilt angles (
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(00)01557-4