Finite size effect in Bi2Sr2CaCu2O(8+d) and YBa2Cu3O6.7 probed by the in-plane and out of plane penetration depths

Details Finite size effect in Bi2Sr2CaCu2O(8+d) and YBa2Cu3O6.7 probed by the in-plane and out of plane penetration depths Finite size effect in Bi2Sr2CaCu2O(8+d) and YBa2Cu3O6.7 probed by the in-plane and out of plane penetration depths

2003-09-02

arxiv.org/abs/cond-mat/0309064v1

Phys. Rev. B 69, 024502 (2004)

Physics

Condensed Matter

Superconductivity

9 pages, 8 figures

Scientific paper

10.1103/PhysRevB.69.024502

We report on a systematic finite size scaling analysis of in-plane penetration depth data taken on Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ epitaxially-grown films and single crystals, and of in-plane and out of plane data taken on YBa$_{2}$Cu$_{3}$O$_{6.7}$ aligned powder. It is shown that the tails in temperature dependence of the penetration depths, appearing around the transition temperature, are fully consistent with a finite size effect. This uncovers the granular nature of these cuprates, consisting of superconducting homogeneous domains of nanoscale extent, embedded in a non-superconducting matrix.

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