Emergence of superconductivity in (NH3)y MxMoSe2 (M: Li, Na and K)

Xiao Miao, Saki Nishiyama, Lu Zheng, Hidenori Goto, Ritsuko Eguchi, Hiromi Ota, Takashi Kambe, Kensei Terashima, Takayoshi Yokoya, Huyen T L Nguyen, Tomoko Kagayama, Naohisa Hirao, Yasuo Ohishi, Hirofumi Ishii, Yen Fa Liao, Yoshihiro Kubozono

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Abstract

We report syntheses of new superconducting metal-doped MoSe2 materials (MxMoSe2). The superconducting MxMoSe2 samples were prepared using a liquid NH3 technique, and can be represented as '(NH3)yMxMoSe2'. The Tcs of these materials were approximately 5.0 K, independent of x and the specific metal atom. X-ray diffraction patterns of (NH3)yNaxMoSe2 were recorded using polycrystalline powders. An increase in lattice constant c showed that the Na atom was intercalated between MoSe2 layers. The x-independence of c was observed in (NH3)yNaxMoSe2, indicating the formation of a stoichiometric compound in the entire x range, which is consistent with the x-independence of Tc. A metallic edge of the Fermi level was observed in the photoemission spectrum at 30 K, demonstrating its metallic character in the normal state. Doping of MoSe2 with Li and K also yielded superconductivity. Thus, MoSe2 is a promising material for designing new superconductors, as are other transition metal dichalcogenides.

Original languageEnglish
Article number29292
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - Jul 11 2016

ASJC Scopus subject areas

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    Miao, X., Nishiyama, S., Zheng, L., Goto, H., Eguchi, R., Ota, H., Kambe, T., Terashima, K., Yokoya, T., Nguyen, H. T. L., Kagayama, T., Hirao, N., Ohishi, Y., Ishii, H., Liao, Y. F., & Kubozono, Y. (2016). Emergence of superconductivity in (NH3)y MxMoSe2 (M: Li, Na and K). Scientific Reports, 6, [29292]. https://doi.org/10.1038/srep29292