| 常压和高压合成MgB2的低温比热及两个超导能隙研究 |
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| 引用本文： | 张杰,雒建林,白海洋,陈兆甲,林德华,车广灿,任治安,赵忠贤,金铎.常压和高压合成MgB2的低温比热及两个超导能隙研究[J].物理学报,2002,51(2):342-346. |
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| 作者姓名： | 张杰 雒建林 白海洋 陈兆甲 林德华 车广灿 任治安 赵忠贤 金铎 |
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| 作者单位： | (1)中国科学院物理研究所,北京100080; (2)重庆大学应用物理系,重庆400044; (3)重庆大学应用物理系,重庆400044;中国科学院物理研究所,北京100080 |
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| 基金项目： | 国家自然科学基金 (批准号 :1982 5 111)资助的课题 |
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| 摘 要： | 测量了常压和高压合成MgB2超导样品6K—80K的比热,并在数据拟合中考虑了爱因斯坦振动模的贡献,得到其电子比热数据.解释了超声测量得到的德拜温度和低温比热拟合结果之间的巨大差异.并且在12K附近观察到了异常的电子比热,此异常来源于MgB2的第二个能隙.此外,对高压和常压合成对样品的影响做了初步分析.
关键词：
低温比热
MgB2
能隙
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| 关 键 词： | 低温比热 MgB2 能隙 |
| 收稿时间： | 2001-11-06 |
| 修稿时间： | 2001年11月6日 |
Study on specific heat and two energy gaps of MgB2 samples prepared by ambient pressure and high pressure |
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| Zhang Jie,Luo Jian-Lin,Bai Hai-Yang,Chen Zhao-Jia,Lin De-Hua,Che Guang-Can,Ren Zhi-an,Zhao Zhong-Xian,Jin Duo.Study on specific heat and two energy gaps of MgB2 samples prepared by ambient pressure and high pressure[J].Acta Physica Sinica,2002,51(2):342-346. |
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| Authors: | Zhang Jie Luo Jian-Lin Bai Hai-Yang Chen Zhao-Jia Lin De-Hua Che Guang-Can Ren Zhi-an Zhao Zhong-Xian Jin Duo |
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| Institution: | Zhang Jie 1)2) Luo Jian-Lin 2) Bai Hai-Yang 2) Chen Zhao-Jia 2) Lin De-Hua 1)Che Guang-Can 2) Ren Zhi-an 2) Zhao Zhong-Xian 2) Jin Duo 2) 1) |
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| Abstract: | Specific heat of MgB 2 prepared by ambient pressure and high pressure has been measured in temperature range from 6K to 80K.The electron contribution to the specific heat is investigated by considering Einstein mode.A large difference between Dybye temperatures obtained by ultrasonic measurement and fitting of low-temperature specific heat is interpreted.An anomaly of electronic specific heat is observed at 12K,which can be attributed to the second energy gap of MgB 2.The effect from different sample preparation methods,i.e. ambient pressure and high pressure,is primarily discussed. |
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| Keywords: | low-temperature specific heat MgB 2 energy gap |
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