Flux creep after field trapping in YBa2Cu3Ox foams

M. R. Koblischka, S. Pavan Kumar Naik, A. Koblischka-Veneva, D. Gokhfeld, M. Murakami

Research output: Contribution to journalArticle

Abstract

The time-dependence of the field distribution on the surface of YBa2Cu3Ox (YBCO) foam samples after field trapping is analysed. The foam samples were magnetised using a bulk permanent magnet at 77 K, and the trapped fields (TFs) were recorded with a scanning Hall probe 1 mm above the sample surface. Besides a large TF peak, several small peaks are observed. The time dependence of the local fields of these peaks and of the large peak are clearly different, which points to a different origin. In this way, the time-dependent TF measurements reveal important information about the current flow in the foam samples. A non-logarithmic relaxation process takes place in the foam samples. Furthermore, we compare these results with classic creep measurements performed on an individual foam strut removed from the bulk. The creep rate for the TF distribution is found to be ∼8%, whereas the creep rate of the foam strut is about 4% in a large temperature and field range (20-60 K, 0-2 T).

Original languageEnglish
Article number044008
JournalSuperconductor Science and Technology
Volume33
Issue number4
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • flux creep
  • superconducting foam
  • trapped fields
  • YBCO

ASJC Scopus subject areas

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

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