Angular Dependence of C-Axis Magnetoresistance in Bi-2212 Single Crystals With Columnar Defects
N. Morozov, L. N. Bulaevskii, M. P. Maley, J. Y. Coulter, A. E. Koshelev, T. -W. Li
Abstract
We measured the angular dependence of the c-axis magnetoresistance rhoc(B) of Bi-2212 irradiated with heavy ions. At temperatures near 68 K the scaling of rhoc(B) with the c-axis magnetic field component Bperp is broken and the in-plane field, Bparallel, affects rhoc. At this temperature, at a specific field Bcr ≈ BPhi/2, magnetoresistance becomes independent of field orientation. This crossing point allows us to estimate the correlation length L of pancake positions along the c axis. We find L/s is about 100 at B=Bcr, where s is the interlayer spacing. This provides evidence of strong enhancement of pancake alignment in the vortex liquid in crystals with columnar defects.
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