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

doi:10.1103/PhysRevB.60.96

Angular Dependence of C-Axis Magnetoresistance in Bi-2212 Single Crystals With Columnar Defects

Superconductivity 2009-10-31 v2

Authors: N. Morozov , L. N. Bulaevskii , M. P. Maley , J. Y. Coulter , A. E. Koshelev , T. -W. Li

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Abstract

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 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.

Keywords

magnetoresistance Bi-2212 columnar defects vortex liquid pancake vortices angular dependence

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@article{arxiv.cond-mat/9812015,
  title  = {Angular Dependence of C-Axis Magnetoresistance in Bi-2212 Single Crystals With Columnar Defects},
  author = {N. Morozov and L. N. Bulaevskii and M. P. Maley and J. Y. Coulter and A. E. Koshelev and T. -W. Li},
  journal= {arXiv preprint arXiv:cond-mat/9812015},
  year   = {2009}
}

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4 pages, 3 figures

Angular Dependence of C-Axis Magnetoresistance in Bi-2212 Single Crystals With Columnar Defects

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