V₂Ga₅: A Superconductor on the Verge of Ferromagnetism

Superconductivity and ferromagnetism are generally competing ground states in d-electron systems, making their coexistence rare. We report a comprehensive study of high-quality single- and polycrystalline V₂Ga₅, a bulk type-II superconductor (T_c = 3.54 K) with a quasi-one-dimensional crystal structure, revealing superconductivity coexisting with ferromagnetic correlations. Below T ≈ 10 K, magnetic susceptibility shows distinct ZFC/FC splitting, along with saturation and hysteresis in M(H), typical of ferromagnetic compounds. Moreover, electrical transport measurements reveal a magnetic-field-dependent resistivity upturn, while specific heat is enhanced in magnetic fields. These results indicate that ferromagnetic correlations develop below T ≈ 10 K, well above T_c, but long-range ferromagnetic order is suppressed by the superconducting transition. The absence of intrinsic magnetic elements, combined with reduced dimensionality, establishes V₂Ga₅ as a clean and tunable platform for exploring the physics at the boundary between superconductivity and itinerant ferromagnetism.