WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2
Zhao Zhi-wen (赵志文), Wen Hai-hu (闻海虎), Li Shi-liang (李世亮), Ni Yong-ming (倪泳明), Ren Zhi-an (任治安), Che Guang-can (车广灿), Yang Hai-peng (杨海朋), Liu Zhi-yong (刘志勇), Zhao Zhong-xian (赵忠贤)
National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract The newly discovered superconductor MgB2 has a transition temperature Tc of about 40 K, which is touching the upper line of that predicted by the phonon-mediated Bardeen--Cooper--Schrieffer (BCS) theory. It is interesting to investigate the flux creep in MgB2 and compare it with other superconductors. We have measured the magnetization relaxation of MgB2 sintered at high temperature and high pressure. It is found that the quantum tunnelling and the thermally activated flux creep are very weak, implying a strong pinning in this material.
Received: 02 March 2001
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No. NSFC 19825111) and the Ministry of Science and Technology of China (Grant No. NKBRSF-G1999064602).
Cite this article:
Zhao Zhi-wen (赵志文), Wen Hai-hu (闻海虎), Li Shi-liang (李世亮), Ni Yong-ming (倪泳明), Ren Zhi-an (任治安), Che Guang-can (车广灿), Yang Hai-peng (杨海朋), Liu Zhi-yong (刘志勇), Zhao Zhong-xian (赵忠贤) WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2 2001 Chinese Physics 10 340
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