Study of Flux Pinning in Zone-melted YBCO by SQUID
JI Helin1,2, SHI Zhixian1,2, ZENG Zhaoyang1,2, JIN Xin1, YAO Xixian1, FAN Zhanguo, SHAN Yuqiao
1Department of Physics, and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008
2National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijiilg 100080
Department of Non-ferrous Metallurgy, Northeast Institute of Technology, Shenyang 110006
Study of Flux Pinning in Zone-melted YBCO by SQUID
JI Helin1,2;SHI Zhixian1,2;ZENG Zhaoyang1,2;JIN Xin1;YAO Xixian1;FAN Zhanguo;SHAN Yuqiao
1Department of Physics, and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008
2National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijiilg 100080
Department of Non-ferrous Metallurgy, Northeast Institute of Technology, Shenyang 110006
Abstract： Magnetic hysteresis loops arid magnetization relaxation of a zone-melted YBa2Cu306+x sample were measured by superconducting quantum interference device (SQUID) at temperature from 4.5 to 70 K. The logarithmic behavior of magnetic decay at 4.5 K arid the gradual deviation as the temperature is increased demonstrated important role of nonlinear current density dependence of effective flux pinning potential U( J) in high temperature superconductors.
JI Helin;SHI Zhixian;ZENG Zhaoyang;JIN Xin;YAO Xixian;FAN Zhanguo;SHAN Yuqiao. Study of Flux Pinning in Zone-melted YBCO by SQUID[J]. 中国物理快报, 1993, 10(8): 496-499.
JI Helin, SHI Zhixian, ZENG Zhaoyang, JIN Xin, YAO Xixian, FAN Zhanguo, SHAN Yuqiao. Study of Flux Pinning in Zone-melted YBCO by SQUID. Chin. Phys. Lett., 1993, 10(8): 496-499.
1993, Vol. 10 
