TY - JOUR
T1 - Phonon scattering by 211 second phase grains in high Tc 123 bulk materials
AU - Noto, K.
AU - Itoh, T.
AU - Sugiyama, A.
AU - Abe, T.
AU - Murakami, M.
AU - Muralidhar, M.
AU - Yoshioka, J.
AU - Iida, K.
N1 - Funding Information:
The author would like to thank S. Fujinuma for technical assistances. This manuscript was prepared by a MC student of Iwate University, Y. Fujine. This work was partly supported by New Energy and Industrial Technology Development Organization (NEDO).
PY - 2001/8
Y1 - 2001/8
N2 - 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.
AB - 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.
KW - High T superconductor
KW - NEG(123)+SP bulk material
KW - Scattering mechanisms
KW - Thermal conductivity
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U2 - 10.1016/S0921-4534(01)00363-X
DO - 10.1016/S0921-4534(01)00363-X
M3 - Article
AN - SCOPUS:0035422285
SN - 0921-4534
VL - 357-360
SP - 747
EP - 750
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
ER -