Details

Autor(en) / Beteiligte

• Chen, Xuliang
• Lu, Pengchao
• Wang, Xuefei
• Zhou, Yonghui
• An, Chao
• Zhou, Ying
• Xian, Cong
• Gao, Hao
• Guo, Zhaopeng
• Park, Changyong
• Hou, Binyang
• Peng, Kunling
• Zhou, Xiaoyuan
• Sun, Jian
• Xiong, Yimin
• Yang, Zhaorong
• Xing, Dingyu
• Zhang, Yuheng

Titel

Topological Dirac line nodes and superconductivity coexist in SnSe at high pressure

Ist Teil von

• Physical review. B, 2017-10, Vol.96 (16), Article 165123

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2017

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• We report on the discovery of a pressure-induced topological and superconducting phase of SnSe, a material which attracts much attention recently due to its superior thermoelectric properties. In situ high-pressure electrical transport and synchrotron x-ray diffraction measurements show that the superconductivity emerges along with the formation of a CsCl-type structural phase of SnSe above around 27 GPa, with a maximum critical temperature of 3.2 K at 39 GPa. Based on ab initio calculations, this CsCl-type SnSe is predicted to be a Dirac line-node (DLN) semimetal in the absence of spin-orbit coupling, whose DLN states are protected by the coexistence of time-reversal and inversion symmetries. These results make CsCl-type SnSe an interesting model platform with simple crystal symmetry to study the interplay of topological physics and superconductivity.