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Chin. Phys. B, 2018, Vol. 27(9): 097103    DOI: 10.1088/1674-1056/27/9/097103
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Pressure effect in the Kondo semimetal CeRu4Sn6 with nontrivial topology

Jiahao Zhang(张佳浩)1,2, Shuai Zhang(张帅)1, Ziheng Chen(陈子珩)2, Meng Lv(吕孟)1,2, Hengcan Zhao(赵恒灿)1,2, Yi-feng Yang(杨义峰)1, Genfu Chen(陈根富)1, Peijie Sun(孙培杰)1
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  

Kondo semimetal CeRu4Sn6 is attracting renewed attention due to the theoretically predicted nontrivial topology in its electronic band structure. We report hydrostatic and chemical pressure effects on the transport properties of single-and poly-crystalline samples. The electrical resistivity ρ(T) is gradually enhanced by applying pressure over a wide temperature range from room temperature down to 25 mK. Two thermal activation gaps estimated from high-and low-temperature windows are found to increase with pressure. A flat ρ(T) observed at the lowest temperatures below 300 mK appears to be robust against both pressure and field. This feature as well as the increase of the energy gaps calls for more intensive investigations with respect to electron correlations and band topology.

Keywords:  CeRu4Sn6      Weyl semimetal      heavy fermion      hydrostatic pressure  
Received:  25 May 2018      Revised:  19 June 2018      Accepted manuscript online: 
PACS:  71.27.+a (Strongly correlated electron systems; heavy fermions)  
  75.30.Mb (Valence fluctuation, Kondo lattice, and heavy-fermion phenomena)  
  72.15.-v (Electronic conduction in metals and alloys)  
Fund: 

Project supported by the Ministry of Science and Technology of China (Grant Nos. 2015CB921303 and 2017YFA0303103), the National Natural Science Foundation of China (Grant Nos. 11474332 and 11774404), and the Chinese Academy of Sciences through the Strategic Priority Research Program (Grant No. XDB07020200).

Corresponding Authors:  Peijie Sun     E-mail:  pjsun@iphy.ac.cn

Cite this article: 

Jiahao Zhang(张佳浩), Shuai Zhang(张帅), Ziheng Chen(陈子珩), Meng Lv(吕孟), Hengcan Zhao(赵恒灿), Yi-feng Yang(杨义峰), Genfu Chen(陈根富), Peijie Sun(孙培杰) Pressure effect in the Kondo semimetal CeRu4Sn6 with nontrivial topology 2018 Chin. Phys. B 27 097103

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