Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ superconductors

A. Hu, H. Zhou, N. Chikumoto, N. Sakai, I. Hirabayashi, M. Murakami

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Abstract

The peak effect in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ crystals was investigated by rotating the angle θ, between applied fields, Ba, and the a-b plane. For Ba ∥ c, the scaling of the pinning force over a wide temperature range showed that the predominant pinning is δTc style pinning. A linear temperature dependence of the peak field, Bp, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85 K, Bp shifted to a higher field, associated with a systematic decrease of the peak amplitude with θ reaching zero. For Ba ∥ ab, the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in- and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.

Original languageEnglish
Pages (from-to)S56-S60
JournalSuperconductor Science and Technology
Volume17
Issue number2
DOIs
Publication statusPublished - 2004 Feb 1

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ASJC Scopus subject areas

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

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