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arXiv 0802.3831cond-mat.supr-con
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具有约化迈斯纳分数的铜酸盐晶体中超导转变附近的涨落抗磁性

Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction

Jesús Mosqueira, Félix Vidal

摘要:

超导转变周围的磁化强度被测量在Tl $_{0.5}$ Pb $_{0.5}$ Sr $_2$ CaCu $_2$ O $_7$晶体中,该晶体受到其有效超导体积分数的相当大的减少($\sim$ 55%)的影响,但仍然具有相对尖锐的低场迈斯纳转变,该行为可能归因于结构不均匀性的存在。考虑到迈斯纳分数中的这些不均匀性,观察到的抗磁性仍然可以用传统的带有库珀对和涡旋涨落的金兹伯格-朗道方法来解释,始终在超导跃迁之上和之下。

英文摘要:

The magnetization around the superconducting transition was measured in a Tl$_{0.5}$Pb$_{0.5}$Sr$_2$CaCu$_2$O$_7$ crystal affected by a considerable reduction ($\sim$55%) of its effective superconducting volume fraction but still with a relatively sharp low-field Meissner transition, a behaviour that may be attributed to the presence of structural inhomogeneities. By taking into account these inhomogeneities just through the Meissner fraction, the observed diamagnetism may still be explained, consistently above and below the superconducting transition, in terms of the conventional Ginzburg-Landau approach with fluctuations of Cooper pairs and vortices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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