Evidence for two vortex phase transitions in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin films
- Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States)
- 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 Univ., West Lafayette, IN (United States)
- DOE Contract Number:
- FG02-90ER45427
- OSTI ID:
- 90492
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 6; Other Information: PBD: 1 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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