Current Flow and Flux Pinning Properties of YBCO Foam Struts

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

Research output: Contribution to journalArticle

1 Citation (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 1

Fingerprint

Flux pinning
struts
Struts
flux pinning
foams
Foams
Critical current density (superconductivity)
dew
Domes
scaling
Magnetization
domes
critical current
Temperature
indication
plots
diagrams
current density
magnetization
temperature

Keywords

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

ASJC Scopus subject areas

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

Cite this

Current Flow and Flux Pinning Properties of YBCO Foam Struts. / Koblischka, Michael Rudolf; Koblischka-Veneva, Anjela Dimitrova; Berger, Kévin; Nouailhetas, Quentin; Douine, Bruno; Reddy, E. S.; Schmitz, Georg J.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 8624451, 01.08.2019.

Research output: Contribution to journalArticle

Koblischka, Michael Rudolf ; Koblischka-Veneva, Anjela Dimitrova ; Berger, Kévin ; Nouailhetas, Quentin ; Douine, Bruno ; Reddy, E. S. ; Schmitz, Georg J. / Current Flow and Flux Pinning Properties of YBCO Foam Struts. In: IEEE Transactions on Applied Superconductivity. 2019 ; Vol. 29, No. 5.
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