Crossover from three-dimensional to two-dimensional vortex fluctuations in the irreversibility line of the Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (0{le}{ital x}{le}0.55) system
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093 (United States)
It is shown that the temperature dependence of the irreversibility line {ital B}({ital T}{asterisk}) of the Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 6.97} (0{le}{ital x}{le}0.55) system, inferred from magnetoresistance measurements, can be described by a Lindemann-type model of a vortex-solid{endash}vortex-fluid phase transition triggered by vortex fluctuations. In this model, the previously observed transition in {ital B}({ital T}{asterisk}) from a power-law temperature dependence near {ital T}{sub {ital c}} to a more rapid dependence below {ital T}{asterisk}/{ital T}{sub {ital c}}{approx_equal}0.6 can be accounted for in terms of a crossover from three-dimensional (3D) to two-dimensional (2D) vortex fluctuations. For different {ital x} values, a lower limit for the anisotropy ratio {gamma} and an upper limit for the crossover magnetic induction {ital B}{sub cr} above which 2D vortex fluctuations dominate were determined. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 278721
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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