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

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

2008-02-26

arxiv.org/abs/0802.3831v1

Phys. Rev. B 77, 052507 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.052507

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.

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