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Superconductivity and magnetic transition in SmFePO were examined by electric, magnetic, ⁵⁷Fe M\"ossbauer, and ¹⁴⁹Sm nuclear resonant forward-scattering (NRFS) measurements. Zero resistivity and negative magnetic susceptibility were observed in an undoped SmFePO, indicating superconducting transition temperature (Tc) of ~3 K. 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 Sm³⁺ ions order antiferromagnetically below magnetic transition ~5 K, accompanying a discontinuous drop in electrical resistivity, whereas ⁵⁷Fe M\"ossbauer 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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Kamihara et al. (2008) studied this question.
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