Phonon scattering by 211 second phase grains in high Tc 123 bulk materials

K. Noto, T. Itoh, A. Sugiyama, T. Abe, Masato Murakami, Muralidhar Miryala, J. Yoshioka, K. Iida

Research output: Contribution to journalArticle

Abstract

Thermal conductivity of OCMG processed NEG123 bulk samples including 5, 10, 20, 30, and 40 mol% NEG211 second phase (SP) have been measured in the temperature range between 15 and 150 K. Thermal conductivity enhancement below Tc was observed in all samples. Magnitude of both thermal conductivity and its enhancement become smaller with increasing SP amount. It turned out that electronic contribution is smaller than 1% of total thermal conductivity. We found a very strong correlation between magnitude of thermal conductivity and the average distance between SP grains. Therefore, we can control the magnitude of thermal conductivity by added amount of SP. Critical current density Jc measured by SQUID magnetometer is larger than 2 × 104 A/cm2 up to 3-4 T for the samples with 5, 10, 20, 30, and 40 mol% SP. From these results, these materials have very good characteristics for high current power leads in relatively large stray field environment.

Original languageEnglish
Pages (from-to)747-750
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug
Externally publishedYes

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Keywords

  • High T superconductor
  • NEG(123)+SP bulk material
  • Scattering mechanisms
  • Thermal conductivity

ASJC Scopus subject areas

  • Condensed Matter Physics

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