SQUID picovoltometry of YBa sub 2 Cu sub 3 O sub 7 single crystals: Evidence for a finite-temperature phase transition in the high-field vortex state

Journal Article · Mon Feb 18 00:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.953· OSTI ID:5854583

Gammel, P L; Schneemeyer, L F; Bishop, D J ^[1]

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1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (US)

Using a SQUID picovoltmeter, we have measured current-voltage curves of YBa{sub 2}Cu{sub 3}O{sub 7} microtwinned crystals as a function of temperature in fields from 1 to 6 T. The data constitute evidence for a finite-temperature phase transition in the vortex state. Exponents derived within the framework of the vortex-glass model are found to be similar to thin-film values. Strongly temperature-dependent correlations involving up to 10{sup 5} vortices near the transition, combined with the qualitative failure of thermal-activation models to fit our data, support the existence of a phase transition.

• OSTI ID: 5854583
• Journal Information: Physical Review Letters; (USA), Vol. 66:7; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRIC CONDUCTIVITY
COPPER OXIDES
YTTRIUM OXIDES
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC FLUX
MONOCRYSTALS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SQUID DEVICES
TEMPERATURE DEPENDENCE
TWINNING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
DATA
DIAGRAMS
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
INFORMATION
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties