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Anomalous low-temperature heat capacity in antiperovskite compounds |
Xin-Ge Guo(郭新格)1,2, Jian-Chao Lin(林建超)1, Peng Tong(童鹏)1, Shuai Lin(蔺帅)1, Cheng Yang(杨骋)1, Wen-Jian Lu(鲁文建)1, Wen-Hai Song(宋文海)1, Yu-Ping Sun(孙玉平)1,3,4 |
1 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China;
3 High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China;
4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China |
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Abstract The low-temperature heat capacities are studied for antiperovskite compounds AXM3 (A=Al, Ga, Cu, Ag, Sn, X=C, N, M=Mn, Fe, Co). A large peak in (C-γT)/T3 versus T is observed for each of a total of 18 compounds investigated, indicating an existence of low-energy phonon mode unexpected by Debye T3 law. Such a peak is insensitive to the external magnetic field up to 80 kOe (1 Oe=79.5775 A·m-1). For compounds with smaller lattice constant, the peak shifts towards higher temperatures with a reduction of peak height. This abnormal peak in (C-γT)/T3 versus T of antiperovskite compound may result from the strongly dispersive acoustic branch due to the heavier A atoms and the optical-like mode from the dynamic rotation of XM6 octahedron. Such a low-energy phonon mode may not contribute negatively to the normal thermal expansion in AXM3 compounds, while it is usually concomitant with negative thermal expansion in open-structure material (e.g., ZrW2O8, ScF3).
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Received: 19 September 2016
Revised: 04 November 2016
Accepted manuscript online:
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PACS:
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65.40.Ba
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(Heat capacity)
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65.40.De
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(Thermal expansion; thermomechanical effects)
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75.20.En
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(Metals and alloys)
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Fund: Project supported by the National Key Basic Research Program of China (Grant Nos. 2011CBA00111) and the National Natural Science Foundation of China (Grant Nos. 51322105, U1632158, 51301165, and 51301167). |
Corresponding Authors:
Peng Tong
E-mail: tongpeng@issp.ac.cn
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Cite this article:
Xin-Ge Guo(郭新格), Jian-Chao Lin(林建超), Peng Tong(童鹏), Shuai Lin(蔺帅), Cheng Yang(杨骋), Wen-Jian Lu(鲁文建), Wen-Hai Song(宋文海), Yu-Ping Sun(孙玉平) Anomalous low-temperature heat capacity in antiperovskite compounds 2017 Chin. Phys. B 26 026501
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