Strong thermal fluctuations in cuprate superconductors in magnetic field above Tc

Abstract

Recent measurements of fluctuation diamagnetism in high temperature superconductors show distinct features above and below Tc, which can not be explained by simple gaussian fluctuation theory. Self consistent calculation of magnetization in layered high temperature superconductors, based on the Ginzburg-Landau-Lawrence-Doniach model and including all Landau levels is presented. The results agree well with the experimental data in wide region around Tc, including both the vortex liquid below Tc and the normal state above Tc. The gaussian fluctuation theory significantly over estimates the diamagnetism for strong fluctuations. It is demonstrated that the intersection point of magnetization curves appears in the region where the lowest Landau level contribution dominates.

arXiv comment5 pages, 4 figures

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• Covariant gaussian approximation in Ginzburg - Landau model
• Study of Nb${}_{0.18}$Re${}_{0.82}$ non-centrosymmetric superconductor in the normal and superconducting states
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Fluctuation Diamagnetism in Two-Band Superconductors
• A quantitative description of Nernst effect in high-temperature superconductors
• Enhanced superconducting-fluctuation effects on thermodynamic properties in BCS-BEC-crossover regime
• Concurrent intersection point of magnetization and magneto-conductivity curves in strongly fluctuating superconductors