Abstract
Superconductivity and magnetic transition in SmFePO were examined by electric, magnetic, $^{57}\text{F}\text{e}$ M\"ossbauer, and $^{149}\text{S}\text{m}$ nuclear resonant forward-scattering (NRFS) measurements. Zero resistivity and negative magnetic susceptibility were observed in an undoped SmFePO, indicating superconducting transition temperature $({T}_{c})$ of $\ensuremath{\sim}3\text{ }\text{K}$. ${T}_{c}$ 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 ${\text{Sm}}^{3+}$ ions order antiferromagnetically below magnetic transition $\ensuremath{\sim}5\text{ }\text{K}$, accompanying a discontinuous drop in electrical resistivity, whereas $^{57}\text{F}\text{e}$ 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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