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Effects of niobium doping on the charge density wave and electronic correlations in the kagome metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>Cs</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mtext>V</mml:mtext><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>Nb</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>Sb</…
The transport and optical properties of Nb-doped $\mathrm{Cs}({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{x}$)${}_{3}{\mathrm{Sb}}_{5}$ with $x=0.03$ and 0.07 have been investigated and compared with those of undoped ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$. Upon Nb doping, the charge density wave (CDW) transition temperature ${T}_{\text{CDW}}$ is suppressed, and the superconducting temperature ${T}_{c}$ rises. The residual resistivity ratio decreases with Nb doping, suggesting …