Monoclinic EuSn_{2}As_{2}: A Novel High-Pressure Network Structure.

@article{Zhao2021MonoclinicEA,
  title={Monoclinic EuSn\_\{2\}As\_\{2\}: A Novel High-Pressure Network Structure.},
  author={Lin Zhao and Changjiang Yi and Chang-Tian Wang and Zhenhua Chi and Yunyu Yin and Xiaoli Ma and J H Dai and Pengtao Yang and Binbin Yue and Jinguang Cheng and Fang Hong and Jian-Tao Wang and Yonghao Han and Youguo Shi and Xiaohui Yu},
  journal={Physical review letters},
  year={2021},
  volume={126 15},
  pages={
          155701
        }
}
The layered crystal of EuSn_{2}As_{2} has a Bi_{2}Te_{3}-type structure in rhombohedral (R3[over ¯]m) symmetry and has been confirmed to be an intrinsic magnetic topological insulator at ambient conditions. Combining ab initio calculations and in situ x-ray diffraction measurements, we identify a new monoclinic EuSn_{2}As_{2} structure in C2/m symmetry above ∼14  GPa. It has a three-dimensional network made up of honeycomblike Sn sheets and zigzag As chains, transformed from the layered EuSn_{2… 
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