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arXiv 2003.09489cond-mat.mtrl-sci
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WTe $_{2}$ Weyl半金属的T $_{d}$到1 T $^{\prime}$结构相变

T$_{d}$ to 1T$^{\prime}$ structural phase transition in WTe$_{2}$ Weyl semimetal

Yu Tao, John A. Schneeloch, Adam A. Aczel, Despina Louca

备注：
6 pages, 3 figures
发表信息：
Phys. Rev. B 102, 060103 (2020)
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摘要：

利用单晶体上的弹性中子散射和粉末X射线衍射测量研究了Weyl半金属WTe $_{2}$的晶体结构随温度的变化。常压下，在$\sim$ 565 K附近观察到从低温正交相（T $_{d}$）到高温单斜相（1 T $^{\prime}$）的急剧转变。与MoTe $_{2}$不同，从T $_{d}$到1 T $^{\prime}$的固-固转变在没有中间T $_{d}^{*}$相的晶胞加倍的情况下发生，其中具有AABB（或ABBA）层堆叠。然而，在粉末中，从T $_{d}$到1 T $^{\prime}$相的热转变被加宽，并且观察到两相共存直到700 K，远高于结构转变。

英文摘要：

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.

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