Hall effect above T sub c in untwinned single-crystal YBa sub 2 Cu sub 3 O sub 7 minus x : Normal-state behavior and superconducting fluctuations
- Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois (USA)
We present a measurement of the Hall coefficient {ital R}{sub {ital H}} for an untwinned single crystal of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}. The crystal was produced by a method that does not involve thermomechanical detwinning, and has a resistivity along the copper-oxide chains of only 29 {mu}{Omega} cm at 100 K, indicating high sample quality. The in-plane resistivity and 1/{ital R}{sub {ital H}} become linear in temperature as {ital T} rises significantly above {ital T}{sub {ital c}}. Near {ital T}{sub {ital c}} we observe deviation from this linearity, and we interpret it as indicating thermodynamic fluctuations in a layered superconductor. Fits of this model to both the resistivity and Hall-effect data yield physically reasonable values for the fitting parameters. Evidence is obtained that the two copper-oxide planes in each unit cell are tightly coupled, acting as one superconducting layer. Surprisingly, the best fits indicate that the Hall-effect fluctuations are dominated by the Maki-Thompson process rather than the Aslamazov-Larkin process.
- OSTI ID:
- 6188870
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 44:18; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
HALL EFFECT
COPPER OXIDES
YTTRIUM OXIDES
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
665411 - Basic Superconductivity Studies- (1992-)