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.
@article{arxiv.1903.00639,
title = {Superconductivity in Potassium-intercalated Td-WTe2},
author = {Li Zhu and Qi-Yuan Li and Yang-Yang Lv and Shichao Li and Xin-Yang Zhu and Zhen-Yu Jia and Y. B. Chen and Jinsheng Wen and Shao-Chun Li},
journal= {arXiv preprint arXiv:1903.00639},
year = {2019}
}