FIELD-DEPENDENCE ANOMALY IN CRITICAL CURRENTS AND GRANULARITY FOR FLUX-GROWN SINGLE-CRYSTAL YBA2CU3O(7-DELTA)

Magnetic hysteresis has been measured for a flux-grown YBa2Cu3O7-delta single crystal over the temperature range 4.2-80 K and in applied fields up to 12 T. Critical current densities j(c) have been derived from these data with the use of the Bean model. At temperatures between 20 and 70 K, it is fou...

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Bibliographic Details
Published in:Superconductor science & technology 1992-06, Vol.5 (6), p.349-352
Main Authors: REN, YR, DEGROOT, PAJ, GENCER, F, ABELL, JS
Format: Article
Language:English
Subjects:
Physical Sciences
Physics
Physics, Applied
Physics, Condensed Matter
Science & Technology
Online Access:Get full text
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Summary:Magnetic hysteresis has been measured for a flux-grown YBa2Cu3O7-delta single crystal over the temperature range 4.2-80 K and in applied fields up to 12 T. Critical current densities j(c) have been derived from these data with the use of the Bean model. At temperatures between 20 and 70 K, it is found that the field dependence of the critical current has a peak in the medium field region. Successive division of the crystal gives a linear dependence of the magnetization M on the length scale R, which indicates that the current circulates around the whole sample. The shape of the magnetic hysteresis curve remains unchanged. Therefore we conclude that granularity is not the reason for the anomalous field dependence of the critical current density in our sample.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/5/6/004