Superconductivity in Potassium-Intercalated Td-WTe2

• DOI: 10.1021/acs.nanolett.8b03180
• Publication Date: 2018-09-18T11:29:57Z
• Authors: Li Zhu; Qi-Yuan Li; Yang-Yang Lv; Shichao Li; Xin-Yang Zhu; Zhen-Yu Jia; Y. B. Chen; Jinsheng Wen; Shao-Chun Li
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Materials Science; Condensed Matter - Superconductivity; 0103 physical sciences; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences

17 pages, 4 figures<br/>To realize topological superconductor is one of the most attracting topics because of its great potential in quantum computation. In this study, we successfully intercalate potassium (K) into the van der Waals gap of type II Weyl semimetal WTe2, and discover the superconducting state in KxWTe2 through both electrical transport and scanning tunneling spectroscopy measurements. The superconductivity exhibits an evident anisotropic behavior. Moreover, we also uncover the coexistence of superconductivity and the positive magneto-resistance state. Structural analysis substantiates the negligible lattice expansion induced by the intercalation, therefore suggesting K-intercalated WTe2 still hosts the topological nontrivial state. These results indicate that the K-intercalated WTe2 may be a promising candidate to explore the topological superconductor.<br/>