Excess of Eu in the (Nd0.33Eu0.33+xGd0.33-x)Ba2Cu3 Oy system: The way to a high irreversibility field at 77 K

Muralidhar Miryala, Naomichi Sakai, Y. Wu, Masato Murakami, M. Jirsa, T. Nishizaki, N. Kobayashi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

With the aim of raising the irreversibility field, we have fabricated (Nd0.33Eu0.33+xGd0.33-x)Ba2Cu3 Oy (NEG-123) bulk superconductors with x = 0.05, 0.07 and 0.1, with the addition of 0, 5 and 10 mol% of (Nd0.33Eu0.33Gd0.33)2BaCuO5 (NEG-211) secondary phase particles. The magnetization loops of all the samples measured with a SQUID magnetometer were open, even at 7 T at 77 K for H//c. The highest irreversibility field of over 14 T, as measured with a vibrating sample magnetometer, was achieved in the sample with x = 0.05 containing 5 mol% NEG-211. Dark-field transmission electron microscopy (TEM) showed a significant structural modulation in this sample and a fine twin-like substructure in the NEG-123 matrix. High-resolution TEM observation further confirmed the presence of a fine twin-like substructure, and also the presence of anti-phase boundaries. TEM and energy dispersive x-ray analyses have clarified that the chemical fluctuations in the NEG-123 matrix grow with increasing secondary phase content. The specific material structure supported by the particular matrix chemical composition is evidently a key parameter for the observed increase of the irreversibility field.

Original languageEnglish
Pages (from-to)1357-1363
Number of pages7
JournalSuperconductor Science and Technology
Volume15
Issue number9
DOIs
Publication statusPublished - 2002 Sep
Externally publishedYes

Fingerprint

Magnetometers
Transmission electron microscopy
SQUIDs
Phase boundaries
High resolution transmission electron microscopy
substructures
magnetometers
transmission electron microscopy
Superconducting materials
Magnetization
matrices
Modulation
X rays
antiphase boundaries
Chemical analysis
chemical composition
electron energy
modulation
magnetization
high resolution

ASJC Scopus subject areas

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

Cite this

Excess of Eu in the (Nd0.33Eu0.33+xGd0.33-x)Ba2Cu3 Oy system : The way to a high irreversibility field at 77 K. / Miryala, Muralidhar; Sakai, Naomichi; Wu, Y.; Murakami, Masato; Jirsa, M.; Nishizaki, T.; Kobayashi, N.

In: Superconductor Science and Technology, Vol. 15, No. 9, 09.2002, p. 1357-1363.

Research output: Contribution to journalArticle

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