Behavior of critical currents in Bi-Pb-Sr-Ca-Cu-O/Ag tapes from transport and magnetization measurements: Dependence upon temperature, magnetic field, and field orientation

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.7566· OSTI ID:7115961

Maley, M P; Kung, P J; Coulter, J Y ^[1]; Carter, W L; Riley, G N ^[2]; McHenry, M E ^[3]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. American Superconductor Corporation, Watertown, Massachusetts 02172 (United States)
3. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

We have measured the dependence of the transport critical current density on magnetic field and temperature of a high-{ital J}{sub {ital c}} Bi-Sr-Ca-Cu-O/Ag tape sample. At low temperature, {ital J}{sub {ital c}}{gt}10{sup 4} A/cm{sup 2} extending to high fields as previously reported by several groups. For {ital T}{gt}20 K and with the applied field parallel to the {ital c} axis {ital J}{sub {ital c}} declines precipitously with increasing field and temperature, reflecting the properties of intragranular pinning. The variation of {ital J}{sub {ital c}} with the angle between {ital B} and the tape normal is consistent with a two-dimensional model of the vortex lattice. Independent determination of {ital J}{sub {ital c}} by magnetic hysteresis measurement shows rough agreement with transport {ital J}{sub {ital c}}'s at low fields but falls below by a factor that increases with increasing field and temperature. This can be accounted for by a model for thermally activated flux motion.

• OSTI ID: 7115961
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 45:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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