Vortex pinning by different angular distributions of columnar defects in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}
- Laboratoire CRISMAT, UMR 6508 associe au CNRS, ISMRA et Universite de Caen 6, Boulevard du Marechal Juin 14050 CAEN Cedex (France)
Different configurations of columnar defects tilted with respect to c have been tailored in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals by controlling the orientation of a heavy-ion beam: One single direction of tracks yielding parallel defects (n=1), two coplanar directions of tracks (n=2), and three directions of tracks symmetrically distributed around the c axis (n=3). The pinning efficiency has been systematically investigated by magnetic measurements with the field applied along c. We found evidence for a low-T regime where the pinning efficiency is nearly independent of n, and a high-T regime where it essentially increases with n. These features are discussed in the frame of two different but not incompatible approaches: (i) a static approach based on accommodation effects, and (ii) a dynamic approach based on elementary flux-creep processes. Finally, the further comparison of these results with angular measurements performed for n=1 strongly suggests that the symmetry of the track distribution relative to the orientation of the applied field might play a major role in the pinning efficiency of splayed configurations. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573808
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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