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 language | English |
|---|---|
| Pages (from-to) | 243-248 |
| Number of pages | 6 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 392-396 |
| Issue number | PART 1 |
| DOIs | |
| Publication status | Published - 2003 Oct |
| Externally published | Yes |
Fingerprint
Keywords
- (Nd-Eu-Gd)Ba CuO
- AgO addition
- Melt-textured superconductor
- Thermal conductivity
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
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.
In: Physica C: Superconductivity and its Applications, Vol. 392-396, No. PART 1, 10.2003, p. 243-248.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of Ag2O addition on thermal conductivity of (Nd-Eu-Gd)Ba2Cu3Oy
AU - Kikegawa-Sasaki, T.
AU - Sato, T.
AU - Miryala, Muralidhar
AU - Noto, K.
AU - Watanabe, K.
AU - Kobayashi, N.
AU - Murakami, Masato
PY - 2003/10
Y1 - 2003/10
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.
AB - 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.
KW - (Nd-Eu-Gd)Ba CuO
KW - AgO addition
KW - Melt-textured superconductor
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=0042190327&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042190327&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(03)01231-0
DO - 10.1016/S0921-4534(03)01231-0
M3 - Article
VL - 392-396
SP - 243
EP - 248
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - PART 1
ER -