DocumentCode
843843
Title
Generic positive effects of low level impurity doping on flux pinning properties of HTSC and MgB2
Author
Shimoyama, J. ; Maruyama, T. ; Shigemori, M. ; Uchida, S. ; Ueda, S. ; Yamamoto, A. ; Katsura, Y. ; Horii, S. ; Kishio, K.
Author_Institution
Dept. of Supercond., Univ. of Tokyo, Japan
Volume
15
Issue
2
fYear
2005
fDate
6/1/2005 12:00:00 AM
Firstpage
3778
Lastpage
3781
Abstract
Low level impurity doping effects on flux pinning properties have systematically studied for Bi(Pb)2212 single crystals, Y123 melt-solidified bulk and MgB2 polycrystalline bulks. In all these systems, moderately dilute impurity doping was found to be effective for improving critical current properties without losing their original Tc. For Bi(Pb)2212, iron, cobalt, nickel and yttrium were effective dopant for enhancement of Jc particularly under low fields. Second peak effect in Jc-H properties of Y123 were observed in Sr doped Y123 bulk. These positive effects were happened only when mean distance of impurity ions was longer than the vortex core size, 2ξab. In the case of MgB2, both aluminum doping for magnesium and carbon doping for boron improved Jc with their low doping levels less than 1%.
Keywords
barium compounds; bismuth compounds; calcium compounds; critical currents; doping; flux pinning; high-temperature superconductors; lead compounds; strontium compounds; yttrium compounds; (BiPb)2Sr2CaCu2O; HTSC; MgB2; YBa2Cu3O7; aluminum doping; carbon doping; critical current properties; flux pinning properties; low level impurity doping; magnesium doping; melt-solidified bulk; polycrystalline bulk; Cobalt; Critical current; Crystals; Doping; Flux pinning; Impurities; Iron; Nickel; Strontium; Yttrium; Bi(Pb)2212; Y123; critical current property; flux pinning; impurity doping;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2005.849429
Filename
1440494
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