Influence of Ag2O addition on thermal conductivity of (Nd-Eu-Gd)Ba2Cu3Oy

T. Kikegawa-Sasaki, T. Sato, M. Muralidhar, K. Noto, K. Watanabe, N. Kobayashi, M. Murakami

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The influence of the Ag2O addition on the thermal conductivity κ of (Nd-Eu-Gd)Ba2Cu3Oy melt-textured superconductors with several amounts of NEG-211 phase has been studied. The concentration of added Ag2O is up to 20 wt.%. The distribution of Ag was observed by back electron image. The critical current density evaluated from a magnetization measurement increases with Ag2O at higher magnetic field, which suggests the precipitation of light rare earth (LRE)-rich fine clusters. It was found that the thermal conductivity below Tc might be determined by the phonon scattering by the LRE-rich fine clusters, which suppress the enhancement of κ, and by the improvement of the crystallographic quality with Ag-doping, by which the enhancement is recovered. In almost all of the samples we measured the latter was dominant. The suppression of κ by the magnetic field H was observed below 110 K. The ratio of κ(H)/κ(H = 0) is almost independent of the amount of Ag2O content.

Original languageEnglish
Pages (from-to)243-248
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume392-396
Issue numberPART 1
DOIs
Publication statusPublished - 2003 Oct 1
Externally publishedYes
EventProceedings of the 15th International Symposium on Superconduc - Yokohama, Japan
Duration: 2002 Nov 112002 Nov 13

Keywords

  • (Nd-Eu-Gd)Ba CuO
  • AgO addition
  • Melt-textured superconductor
  • Thermal conductivity

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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