| MgB2薄膜的制备与特殊性质 |
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| 引用本文： | 吴桃李,王银博,张琰,陈晋平,冯庆荣.MgB2薄膜的制备与特殊性质[J].低温物理学报,2011(3):161-165. |
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| 作者姓名： | 吴桃李 王银博 张琰 陈晋平 冯庆荣 |
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| 作者单位： | 北京大学物理学院;北京大学人工微结构与介观国家重点实验室;北京大学应用超导研究中心; |
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| 基金项目： | 国家973计划项目(批准号:2006CD601004); 国家大学生创新性实验计划(批准号:J0630311)资助的课题~~ |
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| 摘 要： | 本文报道了利用混合物理化学气相沉积方法(HPCVD)在SiC衬底上制备出约150 nm厚,结构均匀的MgB2薄膜.由R~T曲线知道样品TC(0)高达40.1K.由M~T曲线知道其TC=40.4K,且曲线转变十分陡峭.X射线衍射分析表明薄膜具有较好的C轴取向,没有氧污染,却存在Mg的杂峰.由M~H曲线,利用毕恩模型计算得到了5 K零场条件下JC(0T,5K)=2.7×106A/cm2,Hc2=19.5 T.这些结果表明过量的Mg对MgB2薄膜的转变温度以及有些性质有较大的影响.
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| 关 键 词： | 混合物理化学气相沉积法 MgB2薄膜 转变温度TC |
THE SPECIAL PROPERTIES OF MgB_2 THIN FILM ON SiC SUBSTRATE |
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| WU Tao-li WANG Yin-bo ZHANG-Yan CHEN Chin-ping FENG Qing-rong School of Physics,Peking University,Beijing.THE SPECIAL PROPERTIES OF MgB_2 THIN FILM ON SiC SUBSTRATE[J].Chinese Journal of Low Temperature Physics,2011(3):161-165. |
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| Authors: | WU Tao-li WANG Yin-bo ZHANG-Yan CHEN Chin-ping FENG Qing-rong School of Physics Peking University Beijing |
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| Affiliation: | WU Tao-li WANG Yin-bo ZHANG-Yan CHEN Chin-ping FENG Qing-rong School of Physics,Peking University,Beijing,100871 |
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| Abstract: | MgB2 thin films with thickness~150 nm have been synthesized on SiC substrate by using hybrid physical-chemical vapor deposition(HPCVD).XRD analysis shows Mg peaks exist in the sample.M~T measurement indicates that the onset transition temperature TC(onset) is up to 40.4 K.In addition,the critical current density ~JC(5 K,0 T) reaches 2.7×106 A/cm2,with the critical field ~HC2(0) up to19.5 T.These results indicate that the excess of Mg has a great effect on the properties of MgB2 thin film. |
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| Keywords: | hybrid physical-chemical vapor deposition MgB2 thin film excess Mg superconducting transition temperature |
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