Article ID Journal Published Year Pages File Type
1820925 Physica C: Superconductivity and its Applications 2006 4 Pages PDF
Abstract
Two Bi2Sr2CaCu2O8+δ single crystals were characterized, before and after irradiation with 200 MeV Ag ions under fluence of 5 × 1010 ions/cm2. Columnar defects were produced along the c-axis direction in one crystal, and in a direction tilted by an angle of 30° with respect to the c-axis for the other crystal. The 3D-2D vortex decoupling lines were significantly shifted to higher temperatures, after irradiation of the crystals, for magnetic fields smaller than the matching value BΦ ≈ 1 T. For B > 3 T the decoupling lines for the irradiated crystals tend smoothly to the same behavior observed in the original crystals, up to the maximum probed field of 5 T. Interestingly the vortex pinning by columnar defects was found to be almost independent of the applied magnetic field direction, as revealed by the width of magnetization loops.
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Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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