Critical Current Densities in Superconducting Y-Ba-Cu-O Prepared by the Quench-and-Melt Growth Technique
- 1 September 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (9A), L1545-1548
- https://doi.org/10.1143/jjap.28.l1545
Abstract
The critical current characteristic of a Y-Ba-Cu-O specimen prepared by the quench-and-melt growth (QMG) technique was investigated by the ac-inductive method. It was found that there were two kinds of currents. The bulk critical current density is 1.0×108 A/m2 at 77 K and 0.12 T. This value is comparable to a previous estimate from dc-magnetization measurements. The local current density amounts to 3.2×1010 A/m2 under the same conditions. Appearance of two kinds of currents seems to be caused by nonsuperconducting second-phase layers formed along the direction of grain growth, which disturb uniform current.Keywords
This publication has 7 references indexed in Scilit:
- Flux Creep in Sintered Superconducting Y-Ba-Cu-OJapanese Journal of Applied Physics, 1989
- AC Inductive Measurement of Intergrain and Intragrain Currents in High-Tc Oxide SuperconductorsJapanese Journal of Applied Physics, 1988
- Orientation Dependence of Grain-Boundary Critical Currents inBicrystalsPhysical Review Letters, 1988
- High critical currents in Y-Ba-Cu-O superconductorsApplied Physics Letters, 1988
- Melt-textured growth of polycrystalline with high transport at 77 KPhysical Review B, 1988
- Weak link problem and intragrain current density in polycrystalline Bi1Ca1Sr1Cu2Ox and Tl2Ca2Ba2Cu3O10Zeitschrift für Physik B Condensed Matter, 1988
- Critical current and upper critical field of sintered and powdered superconducting YBa2Cu3O7Zeitschrift für Physik B Condensed Matter, 1987