Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air

A. Hu, N. Sakai, K. Ogasawara, M. Murakami

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

Original languageEnglish
Pages (from-to)157-163
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume366
Issue number3
DOIs
Publication statusPublished - 2002 Jan 15

Keywords

  • (Sm,Eu)BaCu O
  • Melt processing
  • Microstructure defect
  • Superconducting properties

ASJC Scopus subject areas

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

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