Pinning Force Scaling Analysis of Polycrystalline MgB2

Research output: Contribution to journalArticle

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
JournalJournal of Superconductivity and Novel Magnetism
DOIs
Publication statusAccepted/In press - 2020

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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