Based on first-principles calculations, we demonstrate that 1H/2H-phase transition metal dichalcogenides MX2 (M=Nb,Ta; X=S,Se,Te) are unconventional metals, which have an empty-site band of A1′@1e elementary band representation at the Fermi level. The computed phonon dispersions indicate the stability of the system at high temperatures, while the presence of the soft phonon mode suggests a phase transition to the charge density wave state at low temperatures. Based on the Bardeen-Cooper-Schrieffer theory and computed electron-phonon coupling, our calculations show that the superconductivity (SC) in NbSe2 is mainly attributed to the soft phonon mode due to the half filling of the empty-site band. Accordingly, the SC has been predicted in unconventional metals TaNS monolayer and 2H-TaN2 bulk with computed TC= 10 K and 26 K respectively. These results demonstrate that the unconventional metals with partial filling of the empty-site band offer an attractive platform to search for superconductors.
@article{arxiv.2306.08347,
title = {Superconductivity in unconventional metals},
author = {Zhilong Yang and Haohao Sheng and Zhaopeng Guo and Ruihan Zhang and Quansheng Wu and Hongming Weng and Zhong Fang and Zhijun Wang},
journal= {arXiv preprint arXiv:2306.08347},
year = {2026}
}