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

Journal Article · · Physical Review B

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
DOE - BASIC ENERGY SCIENCESNSFDOE-NNSAFOREIGN
OSTI ID:
1408118
Journal Information:
Physical Review B, Vol. 96, Issue 16; ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH

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