Comparison between the magnetic and transport critical current densities in high critical current density melt-textured yttrium barium copper-oxide
- 7 January 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (1), 92-94
- https://doi.org/10.1063/1.104401
Abstract
Using our recently developed pulsed critical current density (Jc) measuring system, the Jc of the high Jc melt‐textured YBa2Cu3O7−δ (Y123) bulk samples has been determined. I‐V curves with a voltage resolution of 0.5 μV were obtained, and transport Jc’s along the a‐b plane (Jc∥ a‐b) as high as 7.2×1 04 A/cm2 were extracted. These results are comparable to the values obtained magnetically. On the other hand, transport Jc along the c axis (Jc∥c) were found to be two orders of magnitude smaller, even though the magnetic Jc∥c is only about five times smaller than Jc∥a‐b. We suggest that for the high‐temperature superconducting materials which are highly anisotropic, caution should be taken when using the nontransport magnetic methods to determine Jc.Keywords
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