TY - JOUR
T1 - Effect of Nd4Ba2Cu2O10 addition on the pinning properties of Nd-Ba-Cu-O crystals
AU - Mochida, T.
AU - Chikumoto, N.
AU - Murakami, M.
N1 - Funding Information:
This work was partially supported by NEDO through R & D of the Industrial Technology Frontier Program. The authors would like to thank Dr H. Kojo and Mr K. Sawada for the sample preparation. Thanks are also due to Dr S. I. Yoo, Dr N. Sakai, Mr T. Higuchi, Mr S. Takebayashi and Dr H. S. Chauhan for useful discussions.
PY - 1998
Y1 - 1998
N2 - We have studied the effects of Nd4Ba2Cu2O10 (Nd422) on the pinning characteristics of NdBa2Cu3O7-δ (Nd123) crystals. Like Y2BaCuO5 particles in the Y-Ba-Cu-O system, the addition of Nd422 could enhance critical current density Jc at lower fields. The peak field (Bpk) and the Jc value at Bpk were almost independent of Nd422 contents although a slight decrease in Jc at Bpk was observed with increasing Nd422 contents. The normalized relaxation rate (S) increased for all the samples when the field exceeded Bpk. The addition of Nd422 was effective in preventing a rapid increase in S above Bpk. The exponent μ, defined in the collective creep model, was deduced by fitting the experimental data and was found to show strong field dependence. We found that μ changes from positive to negative at around Bpk, suggesting that the flux creep mechanism is different below and above Bpk.
AB - We have studied the effects of Nd4Ba2Cu2O10 (Nd422) on the pinning characteristics of NdBa2Cu3O7-δ (Nd123) crystals. Like Y2BaCuO5 particles in the Y-Ba-Cu-O system, the addition of Nd422 could enhance critical current density Jc at lower fields. The peak field (Bpk) and the Jc value at Bpk were almost independent of Nd422 contents although a slight decrease in Jc at Bpk was observed with increasing Nd422 contents. The normalized relaxation rate (S) increased for all the samples when the field exceeded Bpk. The addition of Nd422 was effective in preventing a rapid increase in S above Bpk. The exponent μ, defined in the collective creep model, was deduced by fitting the experimental data and was found to show strong field dependence. We found that μ changes from positive to negative at around Bpk, suggesting that the flux creep mechanism is different below and above Bpk.
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U2 - 10.1016/S0964-1807(98)00104-5
DO - 10.1016/S0964-1807(98)00104-5
M3 - Article
AN - SCOPUS:0031988740
SN - 0964-1807
VL - 6
SP - 217
EP - 224
JO - Applied Superconductivity
JF - Applied Superconductivity
IS - 2-5
ER -