Relaxation and pinning in spark-plasma sintered MgB2 superconductor

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number025006
JournalSuperconductor Science and Technology
Volume29
Issue number2
DOIs
Publication statusPublished - 2015 Dec 16

Keywords

  • Bulk MgB superconductor
  • critical currents
  • magnetic properties
  • magnetic relaxation
  • pinning force density

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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