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Understanding the competition between superconductivity and other orderedstates (such as antiferromagnetic or charge-density-wave (CDW) state) is acentral issue in condensed matter physics. The recently discovered layeredkagome metal AV3Sb5 (A = K, Rb, and Cs) provides us a new playground to studythe interplay of superconductivity and CDW state by involving nontrivialtopology of band structures. Here, we conduct high-pressure electricaltransport and magnetic susceptibility measurements to study CsV3Sb5 with thehighest Tc of 2.7 K in AV3Sb5 family. While the CDW transition is monotonicallysuppressed by pressure, superconductivity is enhanced with increasing pressureup to P1~0.7 GPa, then an unexpected suppression on superconductivity happensuntil pressure around 1.1 GPa, after that, Tc is enhanced with increasingpressure again. The CDW is completely suppressed at a critical pressure P2~2GPa together with a maximum Tc of about 8 K. In contrast to a common dome-likebehavior, the pressure-dependent Tc shows an unexpected double-peak behavior.The unusual suppression of Tc at P1 is concomitant with the rapidly damping ofquantum oscillations, sudden enhancement of the residual resistivity and rapiddecrease of magnetoresistance. Our discoveries indicate an unusual competitionbetween superconductivity and CDW state in pressurized kagome lattice.

Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal