论文标题
t $ _ {d} $ to 1t $^{\ prime} $ wte $ _ {2} $ weyl semimetal中的结构相变
T$_{d}$ to 1T$^{\prime}$ structural phase transition in WTe$_{2}$ Weyl semimetal
论文作者
论文摘要
进行了弹性中子散射在单晶和粉末X射线衍射测量上，以研究晶体结构如何演变为Weyl Semimetal WTE $ _ {2} $中温度的函数。从低温正交期（T $ _ {d} $）到高温单斜阶段（1T $^{\ prime} $）的急剧过渡是在环境压力下观察到的，在$ \ sim $ 565 k附近的环境压力下1T $^{\ prime} $发生，没有中间t $ _ {d}^{*} $ aabb（或abba）层堆叠的单元格的单元格。然而，在粉末中，从t $ _ {d} $到1T $^{\ prime} $相位的热过渡被扩大，并观察到两期共存，直到700k，远高于结构过渡。
Elastic neutron scattering on a single crystal and powder X-ray diffraction measurements were carried out to investigate how the crystal structure evolves as a function of temperature in the Weyl semimetal WTe$_{2}$. A sharp transition from the low-temperature orthorhombic phase (T$_{d}$) to the high-temperature monoclinic phase (1T$^{\prime}$) was observed at ambient pressure in the single crystal near $\sim$565 K. Unlike in MoTe$_{2}$, the solid-solid transition from T$_{d}$ to 1T$^{\prime}$ occurs without the cell doubling of the intermediate T$_{d}^{*}$ phase with AABB (or ABBA) layer stacking. In powders however, the thermal transition from the T$_{d}$ to the 1T$^{\prime}$ phase is broadened and a two phase coexistence was observed until 700K, well above the structural transition.
