Superconductivity and magnetic transition in SmFePO were examined by electric, magnetic, F 57 e F57e Mössbauer, and S 149 m S149m nuclear resonant forward-scattering (NRFS) measurements. Zero resistivity and negative magnetic susceptibility were observed in an undoped SmFePO, indicating superconducting transition temperature (T c ) (Tc) of ∼3 K ∼3 K. T c Tc in undoped SmFePO appears in a narrow region of lattice constants with an optimum conductivity. Furthermore, in relation to magnetic susceptibility, NRFS spectra verify that magnetic moments of Sm 3+ Sm3+ ions order antiferromagnetically below magnetic transition ∼5 K ∼5 K, accompanying a discontinuous drop in electrical resistivity, whereas F 57 e F57e Mössbauer spectra show that magnetic moments of Fe are quenched. These results indicate the coexistence of superconductivity and magnetic ordering in a crystallographic unit cell of SmFePO.
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