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Enhanced MgB2 Superconductivity Under High Pressure |
LIU Zhen-Xing;JIN Chang-Qing;YOU Jiang-Yang;LI Shao-Chun;ZHU Jia-Lin;YU Ri-Cheng;LI Feng-Ying;WANG Ru-Ju;SU Shao-Kui
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Laboratory for extreme condition physics, Institute of Physics, and Beijing High Pressure Research Center, Chinese Academy of Sciences, Beijing 100080 |
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Cite this article: |
LIU Zhen-Xing, JIN Chang-Qing, YOU Jiang-Yang et al 2002 Chin. Phys. Lett. 19 120-123 |
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Abstract We report on in situ high-pressure studies up to 1.0 GPa on the MgB2 superconductor which was high-pressure synthesized. The as-prepared sample is of high quality in terms of sharp superconducting transition (Tc) at 39 K from the magnetic measurements. The in situ high-pressure measurements were carried out using a Be-Cu piston-cylinder-type instrument with the mixed oil as the pressure transmitting medium which warrants a quasi-hydrostatic pressure environment at low temperature. The superconducting transitions were measured by using the electrical conductance method. It is found that Tc increases more than 1 K with pressure in the low-pressure range, before the Tc value decreases with the further increase of the pressure.
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Keywords:
74.62.-c
74.62.Fj
81.40.Vw
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Published: 01 January 2002
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PACS: |
74.62.-c
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(Transition temperature variations, phase diagrams)
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74.62.Fj
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(Effects of pressure)
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81.40.Vw
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(Pressure treatment)
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