On the interpretation of the equilibrium magnetization in the mixed state of high-Tc superconductors

Details On the interpretation of the equilibrium magnetization in the mixed state of high-Tc superconductors On the interpretation of the equilibrium magnetization in the mixed state of high-Tc superconductors

2004-05-13

arxiv.org/abs/cond-mat/0405286v2

Physica C 411 (2004) 83--88

Physics

Condensed Matter

Superconductivity

9 pages, 5figures

Scientific paper

10.1016/j.physc.2004.06.007

We apply a recently developed scaling procedure to the analysis of equilibrium magnetization M(H) data that were obtained for T-2212 and Bi-2212single crystals and were reported in the literature. The temperature dependencies of the upper critical field and the magnetic field penetration depth resulting from our analysis are distinctly different from those obtained in the original publications. We argue that theoretical models, which are usually employed for analyses of the equilibrium magnetization in the mixed state of type-II superconductors are not adequate for a quantitative description of high-Tc superconductors. In addition, we demonstrate that the scaled equilibrium magnetization M(H) curve for a Tl-2212 sample reveals a pronounced kink, suggesting a phase transition in the mixed state.

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