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The newly discovered Kagome superconductors $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs)exhibit superconductivity, charge order, and band topology simultaneously. Toexplore the intricate interplay between the superconducting and charge orders,we investigate the doping evolution of superconductivity, charge-density-wave(CDW) order, and band topology in doped topological kagome superconductorsCs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$ where the Ti-dopant introduces hole-like chargecarriers. Despite the absence of the CDW phase transition in doped compoundseven for the lowest doping level of $x=0.047$, the superconductivity survivesin all doped samples with enhanced critical temperatures. The high-resolutionangle-resolved photoemission spectroscopy (ARPES) measurements reveal that theTi-dopant in the kagome plane lowers the chemical potential, pushing the vanHove singularity (VHS) at $M$ point above the Fermi level. First-principlesimulations corroborate the doping evolution of the band structure observed inARPES, and affirm that the CDW instability does not occur once the VHS ispushed above the Fermi level, explaining the absence of the CDW ordering in ourdoped samples Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$. Our results demonstrate acompetition between the CDW and superconducting orders in the kagome-metalsuperconductor CsV$_3$Sb$_5$, although the superconductivity is likelyinconsequential of the CDW order.

Doping evolution of superconductivity, charge order and band topology in hole-doped topological kagome superconductors Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$