Fishtail phenomenon in Ho-added PMP YBCO |
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Authors: | Yong Feng Lian Zhou Lei Shi J G Wen N Koshizuka Wanming Yang Xiaozu Wu |
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Institution: | FENG Yong 1,2,3, ZHOU Lian 1, SHI Lei 4, J. G. Wen 2, N. Koshizuka 2, YANG Wanming 1 and WU Xiaozu 1 1. Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; 2. Superconductivity Research Laboratory, ISTEC 10-13 Shinonome, 1-chome. Koto-ku, Tokyo 135, Japan; 3. CCAST, World Laboratory, Beijing 100080, China; 4. Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The Y 1-xHo xBa-2Cu-3O y superconductors were fabricated by the powder melting process (PMP) method and the magnetic hysteresis loops of these samples were measured at different temperatures by a SQUID magnetometer (up to 7 T). Critical current density was calculated by the Bean critical state model. The results indicate that the fishtail effect is observed in Y 0.6Ho 0.4Ba-2Cu-3O y below 60 K, while no fishtail can be found in Y 0.8Ho 0.2Ba-2Cu-3O y until 30 K. The peak field at which J c reaches its maximum decreases with the increasing magnetic field. In the Y 0.6Ho 0.4Ba-2Cu-3O y sample, the fishtail effect disappears when the temperature is raised to 77 K. In addition, after the Y 0.6Ho 0.4Ba-2Cu-3O y sample was re-sintered at high temperature for a long time, the fishtail can be found in two field directions (H∥C and H⊥C). It is considered that the paramagnetism in the sample may be responsible for the fishtail effect in Ho-added YBCO. Also, the cation disorder created by Ho addition may be another reason for the fishtail. |
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Keywords: | flux pinning fishtail effect element substitutions critical current density |
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