Structural phase transition and transport properties in topological material candidate NaZn_(4)As_(3)  

作　　者：董庆新 阮彬彬 黄奕飞 王义炎 张黎博 白建利 刘乔宇 程靖雯 任治安 陈根富 Qing-Xin Dong;Bin-Bin Ruan;Yi-Fei Huang;Yi-Yan Wang;Li-Bo Zhang;Jian-Li Bai;Qiao-Yu Liu;Jing-Wen Cheng;Zhi-An Ren;Gen-Fu Chen(Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China)

机构地区：[1]Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China [4]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China

出　　处：《Chinese Physics B》2023年第6期447-453,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 11874417 and 12274440);the Strategic Priority Research Program (B) of Chinese Academy of Sciences (Grant No. XDB33010100);the Fund from the Ministry of Science and Technology of China (Grant No. 2022YFA1403903)。

摘　　要：We report a comprehensive study on a layered-structure compound of NaZn_(4)As_(3),which has been predicted to be an ideal topological semimetal(TSM) candidate.It is found that NaZn_(4)As_(3) undergoes a structural transformation from high temperature rhombohedral to a low temperature monoclinic phase.The electric resistivity exhibits a metal-to-insulatorlike transition at around 100 K,and then develops a plateau at low temperature,which might be related to the protected topologically conducting surface states.Our first-principles calculation confirms further that NaZn_(4)As_(3) is a topological insulator(TI) for both different phases rather than a previously proposed TSM.The Hall resistivity reveals that the hole carriers dominate the transport properties for the whole temperature range investigated.Furthermore,an obvious kink possibly associated to the structure transition has been detected in thermopower around ~ 170 K.The large thermopower and moderate κ indicate that NaZn_(4)As_(3) and/or its derivatives can provide a good platform for optimizing and studying the thermoelectric performance.

关 键 词：structural phase transition THERMOELECTRIC topological materials crystal growth 

分 类 号：O469[理学—凝聚态物理]