Cite this article:
Zhao Zhi-wen, Wen Hai-hu, Li Shi-liang, Ni Yong-ming, Ren Zhi-an, Che Guang-can, Yang Hai-peng, Liu Zhi-yong, Zhao Zhong-xian. WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2J. Chin. Phys. B, 2001, 10(4): 340-342.
Zhao Zhi-wen, Wen Hai-hu, Li Shi-liang, Ni Yong-ming, Ren Zhi-an, Che Guang-can, Yang Hai-peng, Liu Zhi-yong, Zhao Zhong-xian. WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2J. Chin. Phys. B, 2001, 10(4): 340-342.
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WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB2
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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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