Vortex localization in single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} with columnar defects
- The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We investigate the effect of columnar defects on the low-temperature magnetic response of a highly anisotropic superconductor. Using a {ital local} magnetic field sensor, the vortex creep rate in single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} containing columnar defects is found to be a highly nonmonotonic function of vortex density. The creep rate is largest when the vortex density is less than the defect density. A strong suppression of the creep rate is observed near the matching field, {ital B}{sub {phi}}, corresponding to equal numbers of vortices and defects. We tentatively associate this finding with the Mott-insulator line phase proposed by Nelson and Vinokur [Phys. Rev. B {bold 48}, 13060 (1993)]. For higher vortex densities, an additional minimum is found near 3{ital B}{sub {phi}}, emphasizing the importance of vortex interactions. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 389354
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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