Pinning Force Scaling Analysis of Polycrystalline MgB2

M. R. Koblischka, A. Wiederhold, A. Koblischka-Veneva, C. Chang

Research output: Contribution to journalArticlepeer-review

Abstract

Flux pinning force scaling f= Fp/ Fp,max vs. h = Ha/Hirr was performed on a variety of pure MgB2 samples, including a spark plasma sintered (SPS) one and a series of samples sintered at various reaction temperatures ranging between 775 and 950 C. The SPS sample exhibits a well-developed scaling at all temperatures, and also the sintered samples prepared at 950 C; however, the obtained peak positions of the pinning force scalings are distinctly different: The SPS sample reveals dominating pinning at grain boundaries, whereas the dominating pinning for the other one is point-pinning. All other samples studied reveal an apparent non-scaling of the pinning forces. The obtained pinning parameters are discussed in the framework of the Dew–Hughes’ pinning force scaling approach.

Original languageEnglish
Pages (from-to)3333-3339
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Volume33
Issue number11
DOIs
Publication statusPublished - 2020 Nov 1

Keywords

  • Core pinning
  • Flux pinning forces
  • Grain boundary pinning
  • MgB
  • Scaling of flux pinning forces

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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