Anisotropically splayed and columnar defects in untwinnedYBa2Cu3O7−δ

Autor: R. M. Ronningen, Lisa Paulius, W. K. Kwok, V. M. Vinokur, G. W. Crabtree, A. M. Petrean
Rok vydání: 1998
Předmět:
Zdroj: Physical Review B. 58:14594-14608
ISSN: 1095-3795
0163-1829
DOI: 10.1103/physrevb.58.14594
Popis: 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}
Databáze: OpenAIRE