Anomalous metallic phase in molybdenum disulphide induced via gate-driven organic ion intercalation

Abstract

Transition metal dichalcogenides exhibit rich phase diagrams dominated by the interplay of superconductivity and charge density waves, which often result in anomalies in the electric transport properties. Here, we employ the ionic gating technique to realize a tunable, non-volatile organic ion intercalation in bulk single crystals of molybdenum disulphide (MoS${}_2$). We demonstrate that this gate-driven organic ion intercalation induces a strong electron doping in the system without changing the pristine $2H$ crystal symmetry and triggers the emergence of a re-entrant insulator-to-metal transition. We show that the gate-induced metallic state exhibits clear anomalies in the temperature dependence of the resistivity with a natural explanation as signatures of the development of a charge-density wave phase which was previously observed in alkali-intercalated MoS${}_2$. The relatively large temperature at which the anomalies are observed ($\sim$$150$ K), combined with the absence of any sign of doping-induced superconductivity down to $\sim$$3$ K, suggests that the two phases might be competing with each other to determine the electronic ground state of electron-doped MoS${}_2$.

arXiv comment11 pages, 5 figures

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• Superconductivity induced by gate-driven hydrogen intercalation in the charge-density-wave compound 1T-TiSe2
• Facile synthesis of palladium hydride via ionic gate-driven protonation using a deep eutectic solvent
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide