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Author Nowak, E. R. ♦ Anders, S. ♦ Jaeger, H. M. ♦ Fendrich, J. A. ♦ Kwok, W. K. ♦ Mogilevsky, R. ♦ Hinks, D. G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ MATERIALS SCIENCE ♦ HIGH-TC SUPERCONDUCTORS ♦ MAGNETIC PROPERTIES ♦ THALLIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ QUATERNARY COMPOUNDS ♦ MONOCRYSTALS ♦ DEFECTS ♦ VORTICES ♦ CREEP ♦ LOCALIZED STATES
Abstract 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.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Department Argonne National Laboratory (ANL), Argonne, IL
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 18
Organization Argonne National Laboratory (ANL), Argonne, IL


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