Correlation of flux lines in single-crystal Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} with columnar defects
- Physik-Institut, University of Zuerich, CH-8057, Zuerich (Switzerland)
- Theoretische Physik, Eidgenoessische Technische Hochschule, CH-8093 Zuerich (Switzerland)
- Kamerlingh Onnes Laboratorium, Leiden University, NL-2300 RA Leiden (Netherlands)
- Physics Department, University of Amsterdam, NL-1018 XE Amsterdam (Netherlands)
A detailed study has been made of the irreversibility line in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, both for unirradiated crystals and also for samples containing irradiation-induced columnar defects aligned at either 0{degree} or 45{degree} to the {ital c} axis. For the unirradiated reference sample the proposed scaling rules for the case of isotropic pinning provide an excellent description of the data. In contrast, for the case of the irradiated samples the breakdown of the scaling due to the presence of anisotropic pinning provides a powerful method with which to trace the development of anisotropic pinning due to correlated disorder. For fields below the matching field {ital B}{sub {Phi}} the existence of strong anisotropic pinning is demonstrated, while for {ital B}{much_gt}{ital B}{sub {Phi}} pinning is shown to be isotropic. A characteristic temperature {ital T}{sub 1} is identified, above which the effect of anisotropic pinning is strongly reduced due to increased thermally induced delocalization of the vortices away from the columnar defects.
- OSTI ID:
- 115840
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANGULAR CORRELATION
ANISOTROPY
BISMUTH OXIDES
CALCIUM OXIDES
CRITICAL CURRENT
CRYSTAL DEFECTS
CUPRATES
DISLOCATION PINNING
EFFECTIVE MASS
HIGH-TC SUPERCONDUCTORS
IRRADIATION
MAGNETIC FLUX
MAGNETIZATION
MOBILITY
SCALING LAWS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
TRANSPORT THEORY