Strong 3D correlations in vortex system of Bi2212:Pb

Details Strong 3D correlations in vortex system of Bi2212:Pb Strong 3D correlations in vortex system of Bi2212:Pb

2003-03-06

arxiv.org/abs/cond-mat/0303103v1

Phys. Rev. B 68, p104506-104514, 2003

Physics

Condensed Matter

Superconductivity

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.68.104506

The experimental study of magnetic flux penetration under crossed magnetic fields in Bi2212:Pb single crystal performed by magnetooptic technique (MO) reveals remarkable field penetration pattern alteration (flux configuration change) and superconducting current anisotropy enhancement by the in-plane field. The anisotropy increases with the temperature rise up to $T_m = 54 \pm 2 K$. At $T = T_m$ an abrupt change in the flux behavior is found; the correlation between the in-plane magnetic field and the out-of-plane magnetic flux penetration disappears. No correlation is observed for $T > T_m$. The transition temperature $T_m$ does not depend on the magnetic field strength. The observed flux penetration anisotropy is considered as an evidence of a strong 3D - correlation between pancake vortices in different CuO planes at $T < T_m$. This enables understanding of a remarkable pinning observed in Bi2212:Pb at low temperatures.

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