Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ superconductors
Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ superconductors
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熔融加工 (Sm, Eu, Gd)Ba2Cu3O7-δ 超导体中倾斜场的峰值效应
DOI：
10.1088/0953-2048/17/2/062
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发表时间：
2004
影响因子：
3.6
通讯作者：
M. Murakami
中科院分区：
文献类型：
--
作者：
A. Hu;Haifeng Zhou;N. Chikumoto;N. Sakai;I. Hirabayashi;M. Murakami
The peak effect in melt-processed (Sm, Eu, Gd)Ba2Cu3O7?? crystals was investigated by rotating the angle ?, between applied fields, Ba, and the a?b plane. For , the scaling of the pinning force over a wide temperature range showed that the predominant pinning is ?Tc style pinning. A linear temperature dependence of the peak field, Bp, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85?K, Bp shifted to a higher field, associated with a systematic decrease of the peak amplitude with ? reaching zero. For , the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in-?and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.
