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The critical state in YBa2Cu3O7-x high temperature superconductor

Bracanovic, D., de Groot, P.A.J., Oussena, M., Porter, S.J., Mironov, O.A., Manton, S.J., Yi, Z., Beduz, C. and McDonald, P.C. (1997) The critical state in YBa2Cu3O7-x high temperature superconductor Cryogenics, 37, (10), pp. 555-557. (doi:10.1016/S0011-2275(97)00044-1).

Record type: Article


A practical method was devised for measurements of the diamagnetic response of high temperature superconductor specimens. The method is useful for the study of the temperature and field dependencies of the local magnetic induction and its two-dimensional visualisation B(T,Ha,x,y) with a resolution of 0.1 gauss and spatial resolution of 0.1 mm in the plane of the specimen surface. The proposed method facilitates quite simple and quick measurements at liquid nitrogen temperature and in applied Ha magnetic field in excess of 1 T. Cross-shaped miniature Hall probes (HPs) of thin film n-InSb on semi-insulating substrate i-GaAs with a small magnetically sensitive zone of 0.1 × 0.1 mm2 were used as measuring transducers. The high degree of doping of n-InSb layers (n ~ 10^18 cm-3) resulted in a sensitivity of 5–7 μV mT-1 (with nominal current up to 10 mA through HPs) and thermosensitivity of less than 0.03% K-1, and made it possible to operate without the need for thermal stabilization of transducers. This method enabled us to study anisotropy of the critical current densities (Jc) of elt-grown YBa2Cu3O(7-x) pellets. Also, we have been able to determine local cracks and grain connectivity in the YBa2Cu3O(7-x) pellet samples.

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Published date: 1997
Additional Information: Low Temperature Engineering and Cryogenics Conference 1996, Southampton, UK, 9-11 July 1996. Edited by R.G. Scurlock
Keywords: high Tc superconductors, critical currents, critical state, microstructure


Local EPrints ID: 21298
ISSN: 0011-2275
PURE UUID: 2210a623-c938-45a1-a4b3-32e08c8584f9

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Date deposited: 20 Nov 2006
Last modified: 24 Jul 2017 16:36

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Author: D. Bracanovic
Author: P.A.J. de Groot
Author: M. Oussena
Author: S.J. Porter
Author: O.A. Mironov
Author: S.J. Manton
Author: Z. Yi
Author: C. Beduz
Author: P.C. McDonald

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