WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2 |
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| Authors: | Zhao Zhi-wen Wen Hai-hu Li Shi-liang Ni Yong-ming Ren Zhi-an Che Guang-can Yang Hai-peng Liu Zhi-yong and Zhao Zhong-xian |
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| Institution: | National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 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. |
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| Keywords: | MgB2 flux creep pinning |
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