Current Flow and Flux Pinning Properties of YBCO Foam Struts

Michael R. Koblischka, Anjela Koblischka-Veneva, Kévin Berger, Quentin Nouailhetas, Bruno Douine, E. S. Reddy, Georg J. Schmitz

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The current flow and the flux pinning properties on struts of superconducting YBa 2 Cu 3 O x foams are analyzed in detail in the temperature range 60 K ≤ T ≤ T c . For this purpose, magnetization loops were measured on foam struts taken from various positions of a 5 × 2 × 2 cm 3 large foam sample prepared at RWTH Aachen. From these data, the critical current densities, j c , and the flux pinning forces, F p = j c × B, were calculated and pinning force scaling diagrams F p /F p ,max versus h = H a /H irr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h 0 , above 0.4, which is an indication of δT c -pinning. The shape of the pinning functions is found to be completely different from all other high-T c materials and varies only slightly with position. This specific dome shape cannot be described by an addition of several pinning functions, and the parameters p and q do not fit to the description of Dew-Hughes. Therefore, we employ Kramer plots to obtainmore information on the flux pinning mechanism.

Original languageEnglish
Article number8624451
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - 2019 Aug

Keywords

  • Foam
  • YBCO
  • critical currents
  • flux pinning
  • scaling

ASJC Scopus subject areas

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

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