Irreversibility field above 14 T at 77 K in (Nd-Eu-Gd) Ba2Cu3Oy

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9 Citations (Scopus)

Abstract

In (Nd0.33 Eu0.38 Gd0.28) Ba2 a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibillty field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-Iamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for Ha ∥ c-axis.

Original languageEnglish
Pages (from-to)3091-3094
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume13
Issue number2 III
DOIs
Publication statusPublished - 2003 Jun 1
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 2002 Aug 42002 Aug 9

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Keywords

  • Critical current density
  • Flux pinning
  • Melt-processed bulk materials
  • STM

ASJC Scopus subject areas

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

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