Measurement of the exponent. mu. in the low-temperature phase of YBa sub 2 Cu sub 3 O sub 7 minus. delta. films in a magnetic field: Direct evidence for a vortex-glass phase

Current-voltage ({ital I}-{ital V}) characteristics were measured for YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films in high magnetic fields and at temperatures well below the superconducting transition temperature. The functional form of the {ital I}-{ital V} curves is described by {ital E}/{...

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Bibliographic Details
Published in:Physical review letters 1992-06, Vol.68:22
Main Authors: Dekker, C., Eidelloth, W., Koch, R.H.
Format: Article
Language:English
Subjects:
360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
GLASS
HIGH-TC SUPERCONDUCTORS
MATERIALS SCIENCE
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
VORTICES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:Current-voltage ({ital I}-{ital V}) characteristics were measured for YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films in high magnetic fields and at temperatures well below the superconducting transition temperature. The functional form of the {ital I}-{ital V} curves is described by {ital E}/{ital J}{proportional to}exp({minus}({ital J}{sub 0}/{ital J}){sup {mu}}), with {ital E} the electric field and {ital J} the current density. The exponent {mu} is 0.19{plus minus}0.05 for low values of current density and {mu}=0.94{plus minus}0.1 at high values. The results at low current density are characteristic of a vortex glass and constitute the first direct evidence that the low-temperature phase of a disordered superconductor is a vortex glass.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.68.3347