Kosterlitz-Thouless transition in high- Tc superconductor films

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.99· OSTI ID:6826874

Davis, L C ^[1]; Beasley, M R ^[2]; Scalapino, D J ^[3]

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1. Research Staff, Ford Motor Company, Dearborn, MI (USA)
2. Department of Applied Physics, Stanford University, Stanford, CA (USA)
3. Department of Physics, University of California, Santa Barbara, CA (USA)

Dynamical theory for the polarization of bound vortex-antivortex pairs near the Kosterlitz-Thouless transition ({ital T}{sub KT}=88.4 K) has been applied to thin films of YBa{sub 2}Cu{sub 3}O{sub 7}. Calculations show that the correct order of magnitude is predicted for the loss function {omega}{ital G}/{ital c}{sup 2} at {ital T}{sub KT}, but the temperature dependence below the transition is wrong. The theoretical value drops much more rapidly with decreasing temperature than observed experimentally. Similar disagreement is found for the penetration depth {lambda}({ital T}). Estimates of the loss function at microwave frequencies show rather large effects near the critical temperature, but these become negligible by 80 K. The performance of microwave devices operating at liquid-N{sub 2} temperature should not be degraded by vortex-antivortex pairs.

• OSTI ID: 6826874
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:1; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BOUND STATE
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FILMS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHASE TRANSFORMATIONS
POLARIZATION
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VORTICES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES