Miscibility relations in AV₃Sb₅ kagome superconductors; properties of single crystal (K,Rb,Cs)V₃Sb₅ alloys and dopants

Chemical tuning, either through alloying or doping, are fundamental ways to probe key structure-property relationships in complex materials. Here we investigate both alloying and doping in the AV₃Sb₅ kagome superconductors (A: K, Rb, Cs). We demonstrate full miscibility on the alkali site in powders, highlighting that the entire (K,Rb,Cs)V₃Sb₅ chemical space exists and further demonstrate our methods for growing (K,Rb,Cs)V₃Sb₅ single crystal alloys. Nonlinear changes in the charge density wave and superconducting temperature are tracked as a function of alkali composition. Analogous comparisons are made for our doped single crystals as a function of both n-type (Te, Cr) and p-type (Sn, Ti) dopants.