Fluctuations of vortices in layered high- T sub c superconductors

Journal Article · Mon Jun 22 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.3773· OSTI ID:7034432

Bulaevskii, L N; Ledvij, M; Kogan, V G ^[1]

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1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

The temperature {ital T}{sub {ital s}} of spontaneous creation of vortex lines in Josephson coupled layered superconductors is obtained by taking into account the entropy contribution to the free energy due to thermal distortions. For Bi- and Ti-based high-{ital T}{sub {ital c}} superconductors and superlattices, the superconducting critical temperature {ital T}{sub {ital s}} lies noticeably below the mean-field transition temperature {ital T}{sub {ital c}0}({ital T}{sub {ital c}0}{minus}{ital T}{sub {ital s}}{approx}4 K or more). The contribution of thermal distortions to the free enery causes significant changes in the temperature and field dependences of magnetization below {ital T}{sub {ital s}} seen in Bi compounds.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 7034432
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:25; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICALITY
ENERGY
ENTROPY
FLUCTUATIONS
FREE ENERGY
HIGH-TC SUPERCONDUCTORS
KOSTERLITZ-THOULESS THEORY
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS
VORTICES