TY - JOUR
T1 - Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123
AU - Chikumoto, N.
AU - Yoshioka, J.
AU - Otsuka, M.
AU - Hayashi, N.
AU - Murakami, M.
PY - 1997/8/1
Y1 - 1997/8/1
N2 - We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O2-Ar. After the high-temperature annealing, a decrease in Jc was observed in most samples even though no appreciable change was observed in Tc. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in Jc-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.
AB - We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O2-Ar. After the high-temperature annealing, a decrease in Jc was observed in most samples even though no appreciable change was observed in Tc. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in Jc-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.
KW - Flux Pinning
KW - High-temperature annealing
KW - Melt-texture
KW - NdBaCuO-
KW - Peak effect
KW - Superconducting transition
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U2 - 10.1016/S0921-4534(97)01454-8
DO - 10.1016/S0921-4534(97)01454-8
M3 - Article
AN - SCOPUS:0031197860
VL - 281
SP - 253
EP - 259
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 2-3
ER -