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Through either elements intercalation or application of pressure, transitionmetal dichalcogenide 1T-TiSe2 exhibits superconductivity in proximity to acharge density wave (CDW) quantum critical point (QCP), thus providing an idealavenue to study the correlation between the two symmetry-breaking exoticquantum electronic states. We report herein that, in addition to the well-knownsuperconducting dome that emerges within the low pressure range of 2 - 4 GPaand peaks with the maximal Tc of about 1.8 K, the pressure induces anotherseparate superconducting transition starting around 15 GPa with a substantiallyhigher Tc that reaches 5.6 K at about 21.5 GPa. The high-pressure X-raydiffraction and Raman spectroscopy measurements unveil that thesuperconductivity reentrant is caused by a first-order structural phasetransition (from P-3m1 space group to Pnma space group), which is alsosupported by the density functional theory calculation. A comparativetheoretical calculation also reveals that the conventional phonon-mediatedmechanism can account for the superconductivity of 1T-TiSe2 under low pressure,while the electron-phonon coupling of 4O-TiSe2 under high pressure is too weakto induce the superconductivity with a Tc as high as 5.6 K. This implies thatthe emergent superconductivity in the 4O-TiSe2 may have an unconventionalorigin. Our finding would open a new window toward the discovery of more exoticquantum states in transition metal dichalcogenides via high pressure.

Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2