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Spin-1/2 kagome materials have recently attracted a resurgence of interest asthey are considered an ideal host of the quantum spin liquid (QSL) state, whichcan underpin functionality such as superconductivity. Here we report the firstsynthesis and characterization of a new oxide-based distorted $S=1/2$ kagomeantiferromagnet (KAFM) in the Zn$_x$Cu$_{5-x}$(VO$_4$)$_{2}$O$_2$CsCl (termedZn$\mathbf {_x}$) series, namely Zn$_2$-averievite, Zn$\mathbf {_2}$ ($x=2$).Using magnetometry, synchrotron diffraction and neutron scattering wedemonstrate an evolution of ground states with $x$ in Zn$\mathbf {_x}$; fromlong-range magnetic order in averievite ($x=0$), via a spin-glass-like groundstate in Zn$\mathbf {_1}$, to a quantum spin liquid (QSL) in Zn$\mathbf {_2}$for which inelastic neutron scattering reveals a gapless continuum ofexcitations. Similar to archetypal $S = 1/2$ KAFMs herbertsmithite andSrCr$_{8.19}$Ga$_{3.81}$O$_{19}$ (SCGO), the dynamic magnetic susceptibility ofZn$\mathbf {_2}$ shows scaling behavior consistent with proximity to a quantumcritical point. The results demonstrate that the new Zn$\mathbf {_2}$ materialis an excellent test bed for achieving the elusive goal of charge carrierdoping in QSL states of $S = 1/2$ KAFMs, in-line with previous theoreticalstudies.

Magnetic ground states and excitations in Zn-doped averieite -- a family of oxide-based $S=1/2$ kagome antiferromagnets