Hexagonal Phase Intergrown with the Tetragonal Weyl Semimetal TaAs
Hexagonal Phase Intergrown with the Tetragonal Weyl Semimetal TaAs
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六方相与四方外尔半金属 TaAs 共生
DOI：
10.1021/acs.cgd.6b01743
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发表时间：
2017
影响因子：
3.8
通讯作者：
Li J. Q.
中科院分区：
文献类型：
--
作者：
Guo C.;Tian H. F.;Yang H. X.;Sun K.;Wei L. L.;Chen G. F.;Li J. Q.
TaAs作为一种著名的拓扑Weyl半金属，近年来引起了人们的极大兴趣。我们的结构研究的微结构特性的TaAs样品使用Cs-校正的透射电子显微镜和扫描透射电子显微镜显然表明存在的六方相共生与已知的tetraxylTaAs（NbAs型）。六方相的结构被确定为具有WC型结构（空间群P6 m2），六方c轴沿着[100]tetra或[010]tetra方向。六方相和四方相之间的晶体学相关性，以及相关的局部原子运动，已被仔细分析。
TaAs as a well-known topological Weyl semimetal has attracted intense interests in recent study. Our structural investigations on the microstructure properties of TaAs samples using Cs-corrected transmission electron microscopy and scanning transmission electron microscopy evidently show the presence of a hexagonal phase intergrown with the known tetragonal TaAs (NbAs-type). The structure of the hexagonal phase is identified to have the WC-type structure (space group P6m2) with hexagonal c-axis along the [100]tetra or [010]tetra direction. The crystallographic correlation between the hexagonal and tetragonal phase, as well as the relevant local atomic motions, has been carefully analyzed.