Enhanced pinning with controlled splay configurations of columnar defects: rapid vortex motion at large angles

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.2563· OSTI ID:284474

Krusin-Elbaum, L; Marwick, A D; Wheeler, R; Feild, C; Vinokur, V M; Leaf, G K; Palumbo, M ^[1]

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1. IBM Research, Yorktown Heights, New York 10598 (United States)

Orders-of-magnitude enhancements of persistent currents {ital J} are reported in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with columnar defects arranged in a variety of splayed configurations. The largest {ital J} is obtained for a planar distribution {ital P}{sub pl}({Theta}), with a splay angle {Theta}{sub opt}={plus_minus}5{degree}. A comparison of {ital P}{sub pl}({Theta}) and a Gaussian distribution {ital P}{sub G}({Theta}) suggests that pinning by the latter is controlled by large-angle tails of the Gaussian which appear to {ital enhance} thermal creep rate. Numerical simulations confirm the existence of the regimes where vortex motion is {ital promoted} rather than {ital suppressed} by splay. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284474
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKYLATING AGENTS
BARIUM OXIDES
COPPER OXIDES
CREEP
CRYSTAL DEFECTS
CURRENT DENSITY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
VORTICES
YTTRIUM OXIDES