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

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

研究成果: Article

1 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)243-248
ページ数6
ジャーナルPhysica C: Superconductivity and its Applications
392-396
発行部数PART 1
DOI
出版物ステータスPublished - 2003 10
外部発表Yes

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Rare earths
Thermal conductivity
thermal conductivity
rare earth elements
Magnetic fields
Phonon scattering
augmentation
magnetic fields
Superconducting materials
Magnetization
critical current
Doping (additives)
retarding
current density
magnetization
Electrons
scattering
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

Influence of Ag2O addition on thermal conductivity of (Nd-Eu-Gd)Ba2Cu3Oy. / Kikegawa-Sasaki, T.; Sato, T.; Miryala, Muralidhar; Noto, K.; Watanabe, K.; Kobayashi, N.; Murakami, Masato.

:: Physica C: Superconductivity and its Applications, 巻 392-396, 番号 PART 1, 10.2003, p. 243-248.

研究成果: Article

Kikegawa-Sasaki, T. ; Sato, T. ; Miryala, Muralidhar ; Noto, K. ; Watanabe, K. ; Kobayashi, N. ; Murakami, Masato. / Influence of Ag2O addition on thermal conductivity of (Nd-Eu-Gd)Ba2Cu3Oy. :: Physica C: Superconductivity and its Applications. 2003 ; 巻 392-396, 番号 PART 1. pp. 243-248.
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AU - Kobayashi, N.

AU - Murakami, Masato

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N2 - 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.

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