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Transport J<inf>c</inf> in Bulk Superconductors: A Practical Approach?
Authors
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,
+10 more
,
,
DA Cardwell
AR Dennis
JH Durrell
CJ May-Miller
KGB Palmer
JP Rush
NA Rutter
YH Shi
Publication date
15 February 2016
Publisher
'Institute of Electrical and Electronics Engineers (IEEE)'
Abstract
© 2016 IEEE.The characterization of the critical current density of bulk high-temperature superconductors is typically performed using magnetometry, which involves numerous assumptions, including, significantly, that Jc within the sample is uniform. Unfortunately, magnetometry is particularly challenging to apply where a local measurement of Jc across a feature, such as a grain boundary, is desired. Although transport measurements appear to be an attractive alternative to magnetization, it is extremely challenging to reduce the cross-sectional area of a bulk sample sufficiently to achieve a sufficiently low critical current that can be generated by a practical current source. In the work described here, we present a technique that enables transport measurements to be performed on sections of bulk superconductors. Metallographic techniques and resin reinforcement were used to create an I-shaped sample of bulk superconductor from a section of Gd-Ba-Cu-O containing 15 wt % Ag2O. The resulting superconducting track had a cross-sectional area of 0.44 mm2. The sample was found to support a critical current of 110 A using a field criterion in the narrowed track region of 1 μV cm-1. We conclude, therefore, that it is possible to measure critical current densities in excess of 2.5 × 108 A m-2 in sections of a bulk superconductor
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Last time updated on 15/07/2020