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The experimental study of magnetic flux penetration under crossed magneticfields in Bi2212:Pb single crystal performed by magnetooptic technique (MO)reveals remarkable field penetration pattern alteration (flux configurationchange) and superconducting current anisotropy enhancement by the in-planefield. The anisotropy increases with the temperature rise up to $T_m = 54 \pm 2K$. At $T = T_m$ an abrupt change in the flux behavior is found; thecorrelation between the in-plane magnetic field and the out-of-plane magneticflux penetration disappears. No correlation is observed for $T > T_m$. Thetransition temperature $T_m$ does not depend on the magnetic field strength.The observed flux penetration anisotropy is considered as an evidence of astrong 3D - correlation between pancake vortices in different CuO planes at $T< T_m$. This enables understanding of a remarkable pinning observed inBi2212:Pb at low temperatures.Comment: 8 pages, 9 figure

physical review. b, condensed matter

Strong three-dimensional correlations in the vortex system for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:mrow><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:…

Strong three-dimensional correlations in the vortex system for(Bi0.7Pb0.3)