Anisotropically splayed and columnar defects in untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
- Materials Science and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60435 (United States)
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States)
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
Pinning by splayed and columnar defects created by 3.9 GeV {sup 197}Au{sup 29+} ions is investigated using transport measurements of vortex motion perpendicular and parallel to the splay plane in untwinned crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. These results are compared with a sample with parallel columnar defects parallel to the {ital c} axis. We report on the temperature, field, and angular dependence of the vortex liquid and solid state. We find that, at twice the matching field, the irreversibility lines for pre- and post-irradiated splayed-defect samples cross. We determine the vortex liquid pinning energy for splayed and columnar defects and show that the barrier to vortex motion perpendicular to the splay plane is greater than that to motion parallel to the splay plane. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 670226
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 58; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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