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Author Kim, M. ♦ Lee, S. ♦ Yu, S. ♦ Hur, N. H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HIGH-TC SUPERCONDUCTORS ♦ MAGNETIZATION ♦ MERCURY OXIDES ♦ BARIUM OXIDES ♦ CALCIUM OXIDES ♦ STRONTIUM OXIDES ♦ COPPER OXIDES ♦ MAGNETIC FLUX ♦ CRITICAL FIELD ♦ COHERENCE LENGTH ♦ PENETRATION DEPTH ♦ SCALING LAWS ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE RANGE 0065-0273 K
Abstract This study measures the temperature dependence of reversible magnetization of grain-aligned HgBa{sub 2}Ca{sub 0.86}Sr{sub 0.14}Cu{sub 2}O{sub 6{minus}{delta}} high-{ital T}{sub {ital c}} superconductor with external magnetic fields parallel to the {ital c} axis. The magnetization is field independent at {ital T}{sup {asterisk}} = 114.5 K, which indicates strong thermal vortex fluctuations. From the vortex fluctuation model, the lower limit of coherence length along the {ital c} axis {xi}{sub {ital c}}(0){approx_equal} 2 and the anisotropy ratio {gamma}{le} 7.7 has been obtained, which implies that this sample is anisotropic three-dimensional (3D) superconductor as Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. These results are supported by good 3D scaling behavior of high-field magnetization around {ital T}{sub {ital c}}({ital H}) as a function of [{ital T}{minus}{ital T}{sub {ital c}}({ital H})]/({ital TH}){sup 2/3}. The thermodynamic critical field {ital H}{sub {ital c}}({ital T}) and the Ginzburg-Landau parameter {kappa} = 114.8 were extracted from the model of Hao {ital et} {ital al}. Also, the various thermodynamic parameters were obtained: the penetration depth {lambda}{sub {ital ab}}(0) = 1913 A, coherence length {xi}{sub {ital ab}}(0) = 13.9 A, and the zero temperature upper critical field {ital H}{sub {ital c}2}(0) = 170.4 T. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 14


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