Irreversible behavior of the transport critical current in polycrystalline YBa2Cu3Oy
- 27 November 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 55 (22) , 2342-2344
- https://doi.org/10.1063/1.102361
Abstract
Temperature and magnetic field dependence of the critical current density Jc and magnetization of the polycrystalline high Tc oxide superconductor YBa2Cu3Oy have been measured. At low temperature, Jc shows a different temperature dependence between field cooling and zero‐field cooling, that is, the Jc value measured when the sample was cooled in a fixed magnetic field was larger than that measured when the sample was cooled in zero magnetic field and then a magnetic field was applied. This irreversible behavior of Jc disappeared at a reduced temperature difference 1–t proportional to H2/3 (H is the magnetic field). Moreover, we have observed that the slope dV/dJ just above Jc began to increase rapidly with increasing temperature above 70 K. These experimental results can be attributed to the effects of grain boundaries.Keywords
This publication has 6 references indexed in Scilit:
- Resistive Transition of High-Temperature SuperconductorsPhysical Review Letters, 1988
- Temperature and Magnetic Field Dependence of the Critical Current in Polycrystalline Ba2YCu3OyJapanese Journal of Applied Physics, 1988
- Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass ModelPhysical Review Letters, 1988
- Observation of subbands in the GaAlAs on two-dimensional electron gas field-effect transistor structuresApplied Physics Letters, 1988
- Critical current densities in sintered Ba-Y-Cu-O compoundPhysics Letters A, 1987
- Largely Anisotropic Superconducting Critical Current in Epitaxially Grown Ba2YCu3O7-y Thin FilmJapanese Journal of Applied Physics, 1987