Novel High-Temperature Superconductors from the Cardone Element Set: A15-Structured V-Dominant Alloys Predicted by Autonomous Composition Search

We present eleven novel superconducting alloy compositions predicted to exceed Tc = 16.8 K, the known ceiling for vanadium-based compounds formed entirely from Cardone-list elements {Li, Ti, V, Ni, Co, Ga, Se, Br, Sn, Ce, Hf, Au, Th}. All eleven are confirmed absent from the Supercon2 database of 40,324 known superconductors. Using a purpose-built three-stage autonomous search engine — combining broad random exploration, neighbourhood refinement, and gradient-ascent convergence — we identify A15-structured V3X-type compositions in which the X-site is occupied by multi-element mixtures of Ti, Sn, Ga, Li, Hf, Th, Au, and Ni. The top predicted compound, V0.750Ti0.122Ga0.057Sn0.071, is predicted at Tc = 21.7 K with electron-phonon coupling λ = 1.038 and ωlog = 295 K. The engine is calibrated to reproduce V (5.4 K) and V3Ga (16.8 K) within 4%, uses Allen-Dynes theory corrected for strong coupling (λ > 1), and applies a physically motivated A15 structural enhancement. These predictions constitute falsifiable experimental targets with accessible synthesis routes via arc-melting or magnetron sputtering.