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

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.3347· OSTI ID:7110716

Dekker, C; Eidelloth, W; Koch, R H ^[1]

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1. IBM Research, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States)

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.

• OSTI ID: 7110716
• Journal Information: Physical Review Letters; (United States), Vol. 68:22; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
VORTICES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
YTTRIUM OXIDES
GLASS
ORDER-DISORDER TRANSFORMATIONS
PHASE STUDIES
TEMPERATURE DEPENDENCE
THIN FILMS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FILMS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)