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29 March 2024
 
  » arxiv » cond-mat/9812015

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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 ;
Date 1 Dec 1998
Subject Superconductivity | cond-mat.supr-con
AbstractWe 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 of rho_c(B) with the c-axis magnetic field component B_perp is broken and the in-plane field, B_parallel, affects rho_c. At this temperature, at a specific field B_cr approx B_Phi/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=B_cr, where s is the interlayer spacing. This provides evidence of strong enhancement of pancake alignment in the vortex liquid in crystals with columnar defects.
Source arXiv, cond-mat/9812015
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