Flux pinning analysis of superconducting YBCO foam struts

Michael Rudolf Koblischka, Anjela Dimitrova Koblischka-Veneva, Crosby Soon Chang, Thomas Hauet, E. S. Reddy, Georg J. Schmitz

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 &#x00D7; 2 &#x00D7; 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, <formula><tex>$F_p = j_c$</tex></formula> &#x00D7; B, were calculated and pinning force scaling diagrams <formula><tex>$F_p/F_{p,max}$</tex></formula> vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K &lt; T &lt; 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of <formula><tex>$\delta T_c$</tex></formula>-pinning. From microstructure analysis using the electron backscatter diffraction technique (EBSD) it is known that the struts are fully converted into the 123-phase with embedded 211 particles being relatively small. The variation of <formula><tex>$F_p$</tex></formula> depending on the position of the struts in the original sample directly reveals the changes of the texture as found employing EBSD.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - 2018 Jan 1

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Keywords

  • Flux pinning
  • flux pinning
  • foam
  • Force
  • irreversibil-ity fields
  • Magnetic field measurement
  • magnetization
  • Microstructure
  • scaling
  • Shape
  • Temperature measurement
  • YBCO
  • Yttrium barium copper oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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