Abstract
We report on the observations of ferromagnetic spin polarized moment and superconductivity in Sn nanoparticles. Ferromagnetic spin polarization, which is characterized by the appearance of Langevin magnetic-field profiles for magnetization, persists even at room temperature. At temperatures below $15\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, magnetic hysteresis emerges in the weak applied magnetic-field regime. Enhanced superconductivity is found for particles with diameters smaller than $16\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ but larger than $9\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The presence of a magnetic field in the superconducting phase reveals a regime in which the magnetic susceptibility and magnetization increase with decreasing temperature. We attribute these behaviors to the coexistence of ferromagnetic spin polarized moment and superconductivity at low temperatures.
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