Structural phase transition in InSn nanoalloys and its impact on superconducting properties

We report on the influence of the nanosized effect on the structural transformation and superconducting properties of InSn nanoalloys with mean sizes ranging from ∼14 to 23 nm fabricated by controlling the argon pressure with the thermal evaporation method. A reversible process of phase transition between γ-Sn and β-InSn was observed using high energy synchrotron x-ray diffraction. An enhanced superconducting transition temperature was observed revealing the main diamagnetic Meissner state to be below TC = 6.22(5) K for the 14(2) nm InSn nanoalloys. Our experimental findings provide important information for controlling the superconducting properties and constituent phases in InSn nanoalloys.