A superconductive shielding can for high T/sub c/ SQUID

The authors have fabricated yttrium-barium-copper-oxygen ceramic superconductive shielding cans and measured the magnetic shielding properties at liquid-nitrogen temperature by using a Hall magnetic sensor and high-T/sub c/ SQUID (superconducting quantum interference device). They report the fabrica...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-03, Vol.25 (2), p.2273-2275
Main Authors: Cui, G.J., Wang, S.G., Jiang, H.M., Li, J.Z., Li, C.Y., Lin, C.D., Liu, R.Z., Zheng, Q.L., Fu, Y.S., Luo, Z.L., Qiao, W.C.
Format: Article
Language:English
Subjects:
Ceramics
Magnetic field measurement
Magnetic liquids
Magnetic properties
Magnetic sensors
Magnetic shielding
SQUIDs
Superconductivity
Temperature sensors
Yttrium
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Summary:The authors have fabricated yttrium-barium-copper-oxygen ceramic superconductive shielding cans and measured the magnetic shielding properties at liquid-nitrogen temperature by using a Hall magnetic sensor and high-T/sub c/ SQUID (superconducting quantum interference device). They report the fabrication processing of the shielding cans and the measurement results. The magnetic properties of the bulk samples are very different from those of conventional superconductors. There are lots of grain boundaries and defects inside the ceramic samples. The magnetic field can penetrate through those defects into the sample easily. The physical density of the samples is of great importance for their superconductive magnetic shielding ability. The isostatic pressing technique, which has been used in this work to prepare a dense and uniform cylinder, is a key processing method.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92761