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We measured the angular dependence of the c-axis magnetoresistance rho_c(B)of Bi-2212 irradiated with heavy ions. At temperatures near 68 K the scaling ofrho_c(B) with the c-axis magnetic field component B_perp is broken and thein-plane field, B_parallel, affects rho_c. At this temperature, at a specificfield B_cr \approx B_Phi/2, magnetoresistance becomes independent of fieldorientation. This crossing point allows us to estimate the correlation length Lof pancake positions along the c axis. We find L/s is about 100 at B=B_cr,where s is the interlayer spacing. This provides evidence of strong enhancementof pancake alignment in the vortex liquid in crystals with columnar defects.Comment: 4 pages, 3 figure

physical review. b, condensed matter

Angular dependence of<i>c</i>-axis magnetoresistance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><…

Angular dependence ofc-axis magnetoresistance inBi2Sr2CaCu<…