Magnetization and critical currents of Bi-Sr-Ca-Cu-O and Ba2YCu3O7 superconductors
- 28 November 1988
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (22), 2223-2225
- https://doi.org/10.1063/1.100508
Abstract
We have measured the critical currrent density Jc as a function of temperature for a Bi‐Sr‐Ca‐Cu‐O sample containing a substantial fraction of a phase with Tc≊110 K and for a Ba2YCu3O7 sample (TTc≊92 K). The behavior of Jc was deduced from magnetization measurements. For both samples the magnetization at fixed temperature and field decayed logarithmically with time. The values of Jc so derived, allowing for the decay to occur, went to zero for temperatures above 35 K for the Bi‐Sr‐Ca‐Cu‐O ceramic and to zero above 70 K for the Ba2YCu3O7 sample. These values are substantially lower than those deduced from dynamic M‐H loops.Keywords
This publication has 11 references indexed in Scilit:
- Thermally Activated Dissipation inPhysical Review Letters, 1988
- Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass ModelPhysical Review Letters, 1988
- A New High-Tc Oxide Superconductor without a Rare Earth ElementJapanese Journal of Applied Physics, 1988
- Levitation of a magnet over a flat type II superconductorJournal of Applied Physics, 1988
- Magnetic characterization of rare-earth barium cuprate superconductorsPhysical Review B, 1987
- Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressurePhysical Review Letters, 1987
- Flux Creep in Type-II SuperconductorsPhysical Review B, 1969
- Theory of Flux Creep in Hard SuperconductorsPhysical Review Letters, 1962
- Critical Persistent Currents in Hard SuperconductorsPhysical Review Letters, 1962
- Magnetization of Hard SuperconductorsPhysical Review Letters, 1962