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Strong 3D correlations in vortex system of Bi2212:Pb

L. S. Uspenskaya·A. B. Kulakov·A. L. Rakhmanov
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Abstract

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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L. S. Uspenskaya, A. B. Kulakov, A. L. Rakhmanov. 2003-03-06. Strong 3D correlations in vortex system of Bi2212:Pb. https://doi.org/10.1103/physrevb.68.104506

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