Thermodynamics of vortices in layered superconductors and the dependence of Tc on anisotropy

Baruch Horovitz

Physica A: Statistical Mechanics and its Applications, 1993, vol. 200, issue 1, 296-304

Abstract: Data on multilayered superconductors such as YBa2Cu3O7⧸PrBa2Cu3O7 show a strong dependence of Tc on anisotropy. In particular, the ratio Tc⧸τ, where τ is the effective XY coupling constant, is found to vary by much more than the theoretical XY limit of 2.4. Layered superconductors allow for an additional anisotropy due to the core energy Ec of vortices perpendicular to the layers. It is shown that if Ec is large, such that the anisotropy is larger than exp(-Ec⧸Tc), Tc is near a fluxon transition which is described by fluctuations of flux loops parallel to the layers. In the latter case Tc⧸τ can vary by more than 2.4, accounting for the data.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:200:y:1993:i:1:p:296-304

DOI: 10.1016/0378-4371(93)90528-C

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