3D {ital XY} Scaling of the Irreversibility Line of YBa{sub 2}Cu{sub 3}O{sub 7} Crystals

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.1730· OSTI ID:538639

Cooper, J R; Loram, J W; Johnson, J D ^[1]; Hodby, J W; Changkang, C ^[2]

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1. IRC in Superconductivity, University of Cambridge, Cambridge, CB3 OHE (United Kingdom)
2. Department of Physics, University of Oxford, Oxford, OX1 3PU (United Kingdom)

We find experimentally that the irreversibility line, H{sub irr}(T) , and the reversible magnetization of twinned YBa{sub 2}Cu {sub 3}O{sub 7} crystals both show 3D XY scaling, which suggests a common origin for both quantities. Analysis of this result and of a correlation between the condensation energy and H{sub irr}(T) of oxygen deficient YBa{sub 2}Cu {sub 3}O{sub 7{minus}{delta}} for 0{lt}{delta}{lt}0.6 , implies that H{sub irr}(T) is strongly influenced by critical fluctuations. It is possible that these values of H{sub irr}(T) and the recently discovered vortex melting line, H{sub m}(T) , both correspond to an upper critical field line which has been suppressed by thermodynamic fluctuations. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538639
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
IRREVERSIBLE PROCESSES
MAGNETIC FLUX
MAGNETIZATION
SCALING
SPECIFIC HEAT
TWINNING
YTTRIUM OXIDES