Relaxation and pinning in spark-plasma sintered MgB2 superconductor

M. Jirsa, M. Rames, M. R. Koblischka, A. Koblischka-Veneva, K. Berger, B. Douine

研究成果査読

12 被引用数 (Scopus)

抄録

The model of thermally activated relaxation developed and successfully tested on high-T c superconductors (Jirsa et al 2004 Phys. Rev. B 70 0245251) was applied to magnetic data of a bulk spark-plasma sintered MgB2 sample to elucidate its magnetic relaxation behavior. MgB2 and the related borides form a superconductor class lying between classical and high-T c superconductors. In accord with this classification, the relaxation phenomena were found to be about ten times weaker than in cuprates. Vortex pinning analyzed in terms of the field dependence of the pinning force density indicates a combined pinning by normal point-like defects and by grain surfaces. An additional mode of pinning at rather high magnetic fields (of still unknown origin) was observed.

本文言語English
論文番号025006
ジャーナルSuperconductor Science and Technology
29
2
DOI
出版ステータスPublished - 2015 12 16
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学

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