TY - JOUR
T1 - Air processing of ternary (Sm,Eu,Gd)Ba2Cu3O 7-δ superconductors with enhanced peak effects
AU - Hu, A.
AU - Sakai, N.
AU - Zhou, H.
AU - Inoue, K.
AU - Chikumoto, N.
AU - Murakami, M.
N1 - Funding Information:
This work is supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. One of authors (AH) thanks NEDO, the Japanese government for providing a research fellowship. We are also grateful for the experimental help from S. Nariki and N. Yamachi.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/2/1
Y1 - 2004/2/1
N2 - High quality (Sm,Eu,Gd)Ba2Cu3O7-δ single domain superconductors were grown in air with BaCuO2-x addition. The flux pinning was investigated with varying temperatures of Ar post-annealing and the Eu/Gd ratio in the initial composition. The amplitude of the peak effect displayed a peak when annealed at 925 °C in Ar while the irreversible field Birr keeping unchanged. Eu enrichment dramatically enhanced Birr and the peak field for the samples annealed at 925 °C in Ar. At 77 K Birr was higher than 9 T in (Sm0.33Eu0.44Gd0.22)Ba2Cu 3O7-δ. Structural characterization showed that the average size of (Sm,Eu,Gd)2BaCuO5 inclusions slightly decreased with increasing the Gd concentration. The scaling analysis and field dependence of superconducting transition evidenced a predominant δT c style pinning induced by local compositional fluctuation. The evolution of flux pinning was thus attributed to variable compositional fluctuation.
AB - High quality (Sm,Eu,Gd)Ba2Cu3O7-δ single domain superconductors were grown in air with BaCuO2-x addition. The flux pinning was investigated with varying temperatures of Ar post-annealing and the Eu/Gd ratio in the initial composition. The amplitude of the peak effect displayed a peak when annealed at 925 °C in Ar while the irreversible field Birr keeping unchanged. Eu enrichment dramatically enhanced Birr and the peak field for the samples annealed at 925 °C in Ar. At 77 K Birr was higher than 9 T in (Sm0.33Eu0.44Gd0.22)Ba2Cu 3O7-δ. Structural characterization showed that the average size of (Sm,Eu,Gd)2BaCuO5 inclusions slightly decreased with increasing the Gd concentration. The scaling analysis and field dependence of superconducting transition evidenced a predominant δT c style pinning induced by local compositional fluctuation. The evolution of flux pinning was thus attributed to variable compositional fluctuation.
KW - (Sm,Eu,Gd)BaCuO
KW - Air processing
KW - Compositional fluctuation
KW - Peak effect
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U2 - 10.1016/j.physc.2003.05.001
DO - 10.1016/j.physc.2003.05.001
M3 - Article
AN - SCOPUS:0345763104
SN - 0921-4534
VL - 402
SP - 127
EP - 135
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -