Topological Dirac line nodes and superconductivity coexist in SnSe at high pressure
Xuliang Chen, Pengchao Lu, Xuefei Wang, Yonghui Zhou, Chao An, Ying Zhou, Cong Xian, Hao Gao, Zhaopeng Guo, Changyong Park, Binyang Hou, Kunling Peng, Xiaoyuan Zhou, Jian Sun, Yimin Xiong, Zhaorong Yang, Dingyu Xing, Yuheng Zhang
DOI 10.1103/PhysRevB.96.165123 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SnSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | 27.2 GPa | onset |
| SnSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | 39 GPa | onset |
| SnSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | 55 GPa | onset |
| SnSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | 58 GPa | unknown |
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