Evidence for two vortex phase transitions in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin films

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.R3880· OSTI ID:90492

Deak, J; McElfresh, M ^[1]; Face, D W; Holstein, W L ^[2]

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1. Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States)
2. DuPont Central Research and Development, P.O. Box 80304, Wilmington, Delaware 19898 (United States)

Consistent with various models of quasi-two-dimensional behavior in strongly anisotropic superconductors, evidence for two separate vortex phase transitions is observed for an epitaxial thin film of the high-temperature superconductor Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}. Based on electric field as a function of current density {ital E}({ital J}) behavior, the temperature dependencies of the resistivity {rho}({ital T}) and dc magnetization {ital M}({ital T}), as well as the frequency dependence of the ac susceptibility {chi}{sub ac}({ital f}), there is strong evidence for a lower-temperature vortex-solid (glass) phase transition to a true superconducting state that is characterized by a loss of linear resistivity. In addition, {rho}({ital T}) and {ital M}({ital T}) results provide evidence for a higher-temperature transition, or crossover, at which the vortex dissipation processes undergo distinctive changes. This transition or crossover may be associated with the coupling of unbound two-dimensional vortices (pancake-vortex liquid) into a liquid of vortex lines as temperature decreases.

• Research Organization: Purdue Research Foundation
• DOE Contract Number: FG02-90ER45427
• OSTI ID: 90492
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
BARIUM OXIDES
CALCIUM OXIDES
CUPRATES
HIGH-TC SUPERCONDUCTORS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
PHASE TRANSFORMATIONS
SUPERCONDUCTING FILMS
THALLIUM OXIDES
VORTICES