Characterization and Critical Current Density Determination of High-T c Superconductor Ba-Y-Cu Oxide
X-ray diffraction is used to characterize a sintered specimen of Ba-Y-Cu oxide which has zero resistance below 91 K and a diamagnetic susceptibility, χ, as large as 43% of the perfect diamagnetism at 84 K. About 90% of the specimen volume is found to be Ba 2 YCu 3 O x . The critical current densitie...
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Published in | Japanese Journal of Applied Physics Vol. 26; no. 5A; p. L873 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
01.05.1987
|
Online Access | Get full text |
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Summary: | X-ray diffraction is used to characterize a sintered specimen of Ba-Y-Cu oxide which has zero resistance below 91 K and a diamagnetic susceptibility, χ, as large as 43% of the perfect diamagnetism at 84 K. About 90% of the specimen volume is found to be Ba
2
YCu
3
O
x
. The critical current densities under zero applied magnetic field are measured to be 105 A/cm
2
at 77 K and 300 A/cm
2
at 4.2 K. The influence of machining of the specimen on χ is investigated. Pulverization of the sintered bulk reduces χ/(-1/4π) from 43% to 14% at 84 K. This reduction is recovered by a subsequent thermal annealing. |
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ISSN: | 0021-4922 1347-4065 |
DOI: | 10.1143/JJAP.26.L873 |