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

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Abstract

Data on multilayered superconductors such as YBa2Cu3O7{plus 45 degree rule}PrBa2Cu3O7 show a strong dependence of Tc on anisotropy. In particular, the ratio Tc{plus 45 degree rule}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{plus 45 degree rule}Tc), Tc is near a fluxon transition which is described by fluctuations of flux loops parallel to the layers. In the latter case Tc{plus 45 degree rule}τ can vary by more than 2.4, accounting for the data.

Original languageEnglish
Pages (from-to)296-304
Number of pages9
JournalPhysica A: Statistical Mechanics and its Applications
Volume200
Issue number1-4
DOIs
StatePublished - 15 Nov 1993

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