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Here we present the superconducting property and structural stability ofkagome CsV3Sb5 under in-situ high pressures. For the initial SC-I phase, its Tcis quickly enhanced from 3.5 K to 7.6 K and then totally suppressed at P~10GPa. Further increasing the applied pressures, an SC-II phase emerges at P~15GPa and persists up to 100 GPa. The Tc rapidly increases to the maximal valueof 5.2 K at P=53.6 GPa and rather slowly decreases to 4.7 K at P=100 GPa. Atwo-dome-like variation of Tc in CsV3Sb5 is concluded here. The Ramanmeasurements demonstrate that weakening of E2g model and strengthening of A1gmodel occur without phase transition as entering the SC-II phase, which issupported by the results of phonon spectra calculations. Electronic structurecalculations reveal that exertion of pressure may bridge the gap of topologicalsurface nontrivial states near EF, i. e. Z2 invariant. Meanwhile, it enlargesFermi surface significantly, consistent with the increased carrier density. Thefindings here point out the change of electronic structure and strengthenedelectron-phonon coupling should be responsible for the pressure-inducedreentrant SC.

Highly-robust reentrant superconductivity in CsV3Sb5 under pressure