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The physical properties of single-crystalline SmBe$_{13}$ with aNaZn$_{13}$-type cubic structure have been studied by electrical resistivity($\rho$), specific heat ($C$), and magnetization ($M$) measurements in magneticfields of up to 9 T. The temperature ($T$) dependence of $\rho$ shows normalmetallic behavior without showing the Kondo -ln$T$ behavior, suggesting theweak hybridization effect in this system. Analyses of the temperaturedependence of $C$ suggest that the Sm ions of this compound are trivalent andthat the crystalline-electric-field (CEF) ground state is a $\Gamma_8$ quartetwith a first-excited state of a $\Gamma_7$ doublet located at the energy scaleof $\sim$ 90 K. Mean-field calculations based on the suggested CEF level schemecan reasonably well reproduce the $T$ dependence of magnetic susceptibility($\chi$) below $\sim$ 70 K. These results in the paramagnetic state stronglyindicate that the 4$f$ electrons are well localized with the Sm$^{3+}$configuration. At low temperatures, the 4$f$ electrons undergo a magnetic orderat $T_{\rm M}$ $\sim$ 8.3 K, where $\chi$($T$) shows an antiferromagnetic-likecusp anomaly. From the positive Curie--Weiss temperature obtained from themean-field calculations and from a constructed magnetic phase diagram withmultiple regions, we discussed the magnetic structure of SmBe$_{13}$ below$T_{\rm M}$, by comparing with other isostructural MBe$_{13}$ compounds showinghelical-magnetic ordering.

Magnetically Ordered State and Crystalline-Electric-Field Effects in SmBe$_{13}$