critical current; crossed fields; magnetic measurements; melt-textured (RE)BCO materials
Abstract :
[en] We have experimentally investigated the crossed magnetic field effects on bulk melt-processed YBCO single domains. The samples were first permanently magnetized along their c-axis and then subjected to several cycles of a transverse magnetic field parallel to the ab planes. The magnetic properties along the c and ab directions were simultaneously measured using a couple of orthogonal pick-up coils as well as a Hall probe placed against the sample surface. The effects of both sweep amplitude and polarity were investigated. Field sweeps of alternate polarities are shown to affect the decay of the c-axis magnetization much more strongly than field sweeps of unique polarity do. However, the c-axis magnetization does not show any saturation even after a large number of field sweeps. Next, a micro-Hall probe scanning system was used to measure the distribution of magnetic induction over the top surface of the single domain subjected to the same combination of magnetic fields. The results are shown to be consistent with those determined with the sensing coils and bring out the role played by geometric effects. (C) 2003 IEEE.
Research Center/Unit :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics Electrical & electronics engineering
Author, co-author :
Vanderbemden, Philippe ; Université de Liège - ULiège > Capteurs et systèmes de mesures électriques
Dorbolo, Stéphane ; Université de Liège - ULiège > Département de physique > Physique statistique
Hari-Babu, N.; University of Cambridge > IRC in Superconductivity
Ntatsis, A.; University of Cambridge > IRC in Superconductivity
Cardwell, D. A.; University of Cambridge > IRC in Superconductivity
Campbell, A. M.; University of Cambridge > IRC in Superconductivity
Language :
English
Title :
Behavior of bulk melt-textured YBCO single domains subjected to crossed magnetic fields
Publication date :
June 2003
Journal title :
IEEE Transactions on Applied Superconductivity
ISSN :
1051-8223
Publisher :
IEEE-Inst Electrical Electronics Engineers Inc, Piscataway, United States - New Jersey
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE] UE - Union Européenne [BE]
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