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Unusual thermodynamics of low-energy phonons in the Dirac semimetal Cd3As2 |
| Zhen Wang(王振)1,2, Hengcan Zhao(赵恒灿)1, Meng Lyu(吕孟)1, Junsen Xiang(项俊森)1, Qingxin Dong(董庆新)1,2, Genfu Chen(陈根富)1,2,3, Shuai Zhang(张帅)1,2,3, and Peijie Sun(孙培杰)1,2,3,† |
1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract By studying the thermal conductivity, specific heat, elastic modulus, and thermal expansion as a function of temperature for Cd3As2, we have unveiled a couple of important thermodynamic features of the low-energy phonons strongly interacting with Dirac electrons. The existence of soft optical phonons, as inferred from the extremely low thermal conductivity, is unambiguously confirmed by low-temperature specific heat revealing significant deviation from Debye's description. The estimated Debye temperature is small in the range of 100—200 K and varies significantly depending upon the measurement used in its experimental determination. The thermodynamic Grüneisen ratio γ reveals a remarkable reduction below about 100 K, an energy scale that is highly relevant to the Dirac states, towards negative values below about 10 K that are indicative of lattice instability.
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Received: 11 May 2022
Revised: 10 June 2022
Accepted manuscript online:
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PACS:
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65.40.-b
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(Thermal properties of crystalline solids)
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65.40.De
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(Thermal expansion; thermomechanical effects)
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63.20.kd
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(Phonon-electron interactions)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974389, 12141002 and 52088101), the National Key R&D Program of China (Grant No. 2017YFA0303100), the Chinese Academy of Sciences through the Scientific Instrument Developing Project (Grant No. ZDKYYQ20210003), and the Strategic Priority Research Program (Grant No. XDB33000000). |
Corresponding Authors:
Peijie Sun
E-mail: pjsun@iphy.ac.cn
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Cite this article:
Zhen Wang(王振), Hengcan Zhao(赵恒灿), Meng Lyu(吕孟), Junsen Xiang(项俊森), Qingxin Dong(董庆新), Genfu Chen(陈根富), Shuai Zhang(张帅), and Peijie Sun(孙培杰) Unusual thermodynamics of low-energy phonons in the Dirac semimetal Cd3As2 2022 Chin. Phys. B 31 106501
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