Vanishing of the upper critical field in Bi_2Sr_2CaCu_2O_{8+δ} from Landau-Ott scaling
arXiv:0707.1661 · doi:10.1103/PhysRevB.76.052504
Abstract
We apply Landau-Ott scaling to the reversible magnetization data of BiSrCaCuO published by Y. Wang et al. [\emph{Phys. Rev. Lett. \textbf{95} 247002 (2005)}] and find that the extrapolation of the Landau-Ott upper critical field line vanishes at a critical temperature parameter, T^*_c, a few degrees above the zero resistivity critical temperature, T_c. Only isothermal curves below and near to T_c were used to determine this transition temperature. This temperature is associated to the disappearance of the mixed state instead of a complete suppression of superconductivity in the sample.
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