| 碳含量对Y-Ni-B-C超导相的形成与临界温度的影响 |
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| 引用本文： | 王芳卫,严启伟,袁 鹏,沈保根,张泮霖.碳含量对Y-Ni-B-C超导相的形成与临界温度的影响[J].物理学报,1999,48(13):56-61. |
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| 作者姓名： | 王芳卫 严启伟 袁 鹏 沈保根 张泮霖 |
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| 作者单位： | 中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080 |
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| 摘 要： | 报道ThCr2Si2型结构的四元金属间化合物Y2Ni2B2Cx的形成与超导电性.当碳配比含量x=0.9—1.2时，电弧熔炼的合金结晶为较好的YNi2B2C单相.当x＜0.8或x＞1.2时，合金中虽仍以YNi2B2C为主相，但杂相明显增加.超导转变温度Tc随碳含量增加明显分为两个台阶.x≤0.8时，Tc约为12.5K；x≥0.9时，Tc约为15K.
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| 收稿时间： | 1999-06-10 |
Effects of Carbon Content on the Formation and Critical Temperature of Y-Ni-B-C Superconductor |
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| Wang Fang-Wei,Yan Qi-Wei,Yuan Peng,Shen Bao-Gen and Zhang Pao-Lin.Effects of Carbon Content on the Formation and Critical Temperature of Y-Ni-B-C Superconductor[J].Acta Physica Sinica,1999,48(13):56-61. |
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| Authors: | Wang Fang-Wei Yan Qi-Wei Yuan Peng Shen Bao-Gen and Zhang Pao-Lin |
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| Abstract: | In this paper, we report the formation and superconductivity of quaternary intermetallic system Yni2B2Cx with ThCr2Si2-type structure. Samples prepared by arc-melting crystallize in single phase of the composition of YNi2B2Cx when x=0.9—1.2 while the secondary unknown phases increase obviously when x＜0.8 or x＞1.2. Superconducting-transition temperature Tc determined by the tem,perature dependence of magnetization displays two steps with increasing carbon concentration: Tc≈12.5K for x≤0.8, Tx≈15K for x≥0.9. |
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