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

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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
JournalSuperconductor Science and Technology
Issue number2
Publication statusPublished - 2005 Feb


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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