CUED Publications database

Magnetic field and current distributins in melt-textured YBa 2Cu 3O 7-x with an artificial grain boundary

Kawano, K and Abell, JS and Bradley, AD and Lo, W and Cardwell, DA (2001) Magnetic field and current distributins in melt-textured YBa 2Cu 3O 7-x with an artificial grain boundary. IEEE Transactions on Applied Superconductivity, 11. pp. 3505-3508. ISSN 1051-8223

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Abstract

Using a magneto-optical (MO) technique, magnetic field distributions have been measured in a melt-textured YBa 2Cu 3O 7-x bulk superconductor, joined to form an artificial grain boundary (GB), in an external magnetic field perpendicular to the sample surface. The magnetic field at a weak section of the GB shows different values between the field increasing up to 150mT and decreasing down to 0T after zero-field-cooling. Namely, the magnetic field in increasing field is higher than that in decreasing field, even in the same external field. This result supports a model in which such differences in magnetic field at the weak-link GB give rise to the hysteresis behavior in the field dependence of transport critical current density in polycrystalline samples. The field distributions across a well-joined region of the GB behave similarly to the adjoining bulk material and this result indicates the possibility of creating useful artifacts provided that the strongly coupled sections can be reproduced on a larger scale.

Item Type: Article
Uncontrolled Keywords: Grain boundary Hysteresis Magneto-optic Y-Ba-Cu-O bulk
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:34
Last Modified: 30 Nov 2014 21:46
DOI: 10.1109/77.919819