Superconductivity in the Z 2 kagome metal KV 3 Sb 5

Here we report the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal ${\\mathrm{KV}}_{3}{\\mathrm{Sb}}_{5}$. Magnetic susceptibility, resistivity, and heat capacity measurements reveal superconductivity below ${T}_{c}=0.93\\phantom{\\rule{0.28em}{0ex}}\\mathrm{K}$, and density functional theory (DFT) calculations further characterize the normal state as a ${\\mathbb{Z}}_{2}$ topological metal. Our results demonstrate that the recent observation of superconductivity within the related kagome metal ${\\mathrm{CsV}}_{3}{\\mathrm{Sb}}_{5}$ is likely a common feature across the $A{\\mathrm{V}}_{3}{\\mathrm{Sb}}_{5}$ ($A$: K, Rb, Cs) family of compounds and establishes them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.