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Author Fukumoto, Y. ♦ Zhu, Y. ♦ Li, Q. ♦ Wiesmann, H. J. ♦ Suenaga, M. ♦ Kaneko, T. ♦ Sato, K. ♦ Shibutani, K. ♦ Hase, T. ♦ Hayashi, S. ♦ Simon, C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HIGH-TC SUPERCONDUCTORS ♦ CRITICAL CURRENT ♦ BISMUTH OXIDES ♦ LEAD OXIDES ♦ STRONTIUM OXIDES ♦ CALCIUM OXIDES ♦ COPPER OXIDES ♦ LEAD IONS ♦ ION COLLISIONS ♦ GEV RANGE 01-10 ♦ MAGNETIC FLUX ♦ VORTICES ♦ TEMPERATURE RANGE 0013-0065 K ♦ MULTI-ELEMENT COMPOUNDS ♦ PINNING
Abstract Powder-in-the Ag tube processed Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} and (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} tapes were irradiated with 5.8-GeV Pb ions along the tape normal for the ion fluences of 0.68, 1.0, and 2.0{times}10{sup 11} cm{sup {minus}2}. The angular ({theta}) dependence of critical current densities {ital J}{sub {ital c}}({theta},{ital B},{ital T}) for these tapes was measured at temperature {ital T}=27 K and 55{endash}80 K. Cusplike sharp peaks in {ital J}{sub {ital c}}({theta},{ital B},{ital T}) were observed for {ital T}{ge}55 K when the applied magnetic field {ital B} is oriented parallel to the direction of the irradiation ({theta}=90{degree}), and {ital J}{sub {ital c}}({theta}) did not scale with the perpendicular component of {ital B}, ({ital B}{sub {perpendicular}}={ital B}sin{theta}). Based on this evidence, it was concluded that the magnetic vortices behave as linelike (three-dimensional) rather than the pancakelike [two-dimensional (2D)] objects in these irradiated superconductors. However, at 27 K, neither the peaks in {ital J}{sub {ital c}}({theta}) nor the scaling of {ital J}{sub {ital c}}({theta}) with {ital B}{sub {perpendicular}} was observed. We attribute this to the increased strength of the isotropic pinning by the small irradiation-induced defect debris relative to that of the columns and due to the increased interlayer coupling strength at reduced temperature, but not as evidence for the pancakelike 2D vortices at low temperatures. Also, for {ital T}{ge}55 K, the enhancement in the pinning strength qualitatively followed the theory by Nelson and Vinokur [Phys. Rev. Lett. {bold 68}, 2398 (1992); Phys. Rev. B {bold 48}, 13060 (1993)]. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-10-01
Publisher Department Brookhaven National Lab. (BNL), Upton, NY (United States)
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 14
Organization Brookhaven National Lab. (BNL), Upton, NY (United States)


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