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Flux jumps anomalous behaviour in FAST-processed MgB2 composites

G. ALDICA1,* , P. BADICA1, C. PLAPCIANU1, J. R. GROZA2, S. POPA1

Affiliation

  1. National Institute of Materials Physics, Magurele, POBox Mg-7, RO-077125 Romania
  2. Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616-5294, USA

Abstract

Superconductor MgB2 has a significant potential for practical applications, but undesirable flux jumps in magnetization curves at low temperature and at moderate or intermediate magnetic fields prevent its widespread use. In the present work, we analyzed the flux-jumps tendency in MgB2 bulk doped with SiC, B4C and metallic Mg. Samples were prepared by fieldassisted-sintering (FAST) as composites with up to three intercalated Fe-foils. Samples produced by FAST showed quite different phase structures clearly influencing pinning and thermo-magnetic instability features due to inhomogeneous materials structure or due to dopants. The largest flux jumps are observed in samples with high critical current density, as usually observed in conventional MgB2 bulks. However, jumps patterns are different and do not perfectly follow the jumps – critical current dependence, especially for the samples with Mg-addition..

Keywords

Thermo-magnetic instability, MgB2 superconductor, Field assisted sintering, B4C, SiC, Mg..

Submitted at: Aug. 2, 2010
Accepted at: Sept. 15, 2010

Citation

G. ALDICA, P. BADICA, C. PLAPCIANU, J. R. GROZA, S. POPA, Flux jumps anomalous behaviour in FAST-processed MgB2 composites, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 9, pp. 2000-2003 (2010)