Superconducting levitation at 90 K - A base for construction of non-contact liquid oxygen pumps

M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami, N. Koshizuka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba2Cu3Oy, 'NEC-123' with a Gd 2BaCuO5 (Gd-211) addition. A reasonable amount of the Gd-211 particles refined by a long-term ball milling to about 70-200 nm reduced their size during the melt-texturing process down to 20-50 nm. Chemical analyses revealed that these particles contained a significant amount of zirconium. These particles caused Jc enhancement by an order of magnitude not only at 77 K but also at 90 K. As a result, we could levitate a permanent magnet over the (Nd, Eu, Gd)Ba2Cu3Oy superconductor cooled by liquid oxygen. This is a path to non-contact pumps of liquid oxygen for different fields of practice.

Original languageEnglish
Pages (from-to)S47-S51
JournalSuperconductor Science and Technology
Volume18
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1

ASJC Scopus subject areas

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

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