Accommodation of vortices to tilted line defects in high-{ital T}{sub {ital c}} superconductors with various electronic anisotropies
- Laboratoire Cristallographie et Sciences des Materiaux, CNRS, URA 1318, Institut des Sciences de la Matiere et du Rayonnement, Universite de Caen, Bd du Marechal Juin, 14050 Caen cedex (France)
Columnar defects (CD{close_quote}s) inclined at 45{degree} from the {ital c} axis have been introduced in single crystals of different compounds: Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}, Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}, Tl{sub 2/3}Bi{sub 1/3}Sr{sub 2}CaCu{sub 2}O{sub 7}, and YBa{sub 2}Cu{sub 3}O{sub 7}. In each case, hysteresis loops have been recorded with the magnetic field parallel to the columns ({ital H}{searrow}{sub {ital a}}{parallel}CD) and perpendicular to them ({ital H}{searrow}{sub {ital a}}{perpendicular}CD). Two regimes are evidenced: an isotropic pinning enhancement [{ital J}{sub {ital c}}({ital H}{searrow}{sub {ital a}}{perpendicular}CD){equivalent_to}{ital J}{sub {ital c}}({ital H}{searrow}{sub {ital a}}{parallel}CD)] at low temperatures and a directional effect [{ital J}{sub {ital c}}({ital H}{searrow}{sub {ital a}}{perpendicular}CD){lt}{ital J}{sub {ital c}}({ital H}{searrow}{sub {ital a}}{parallel}CD)] at higher temperatures. The isotropic regime is ascribed to the occurrence of a {open_quote}{open_quote}totally adjusted{close_quote}{close_quote} state where the vortices zigzag between the CD{close_quote}s and the {ital ab} planes, keeping their mean direction along the applied field. An analysis is proposed for the crossover between these two regimes, which accounts for the observed influences of the temperature and electronic anisotropy. The vanishing of the difference between the two configurations at zero field is discussed in terms of a complete reorientation of the vortices along the CD{close_quote}s in the case {ital H}{sub {ital a}}{perpendicular}CD. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 285637
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 1; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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