Magnetic anisotropy of single-crystal ferromagnetic Ce 3 RuSn 6

Using the Czochralski pulling method, we have grown a single-crystal of orthorhombic ${\text{Ce}}_3$${\text{RuSn}}_6$ that exhibits a ferromagnetic transition. Here we present electrical resistivity, specific heat, and magnetization measurements of this sample in the temperature range from 2 to 300 K. The electrical resistivity $\rho$ displays a $-$ln$T$ temperature dependence from 20 K to above the Curie temperature $T_C$ = 3 K. At $T_C$, $\rho$ decreases, and the specific heat $C$ exhibits a sharp peak due to the magnetic transition. The magnetization measurements reveal that the magnetization $M$ is highly anisotropic, and the magnetic structure below $T_C$ is probably not a simple ferromagnetic structure. When the magnetic field $B$ is applied along the b-axis or the c-axis, $M$ shows a ferromagnetic-like rapid increase or an antiferromagnetic-like cusp anomaly, respectively, at $T_C$. Moreover, for $B\left|\right|c$, a metamagnetic-like anomaly appears in the magnetization curve at $B$ = 2.5 T. However, for $B\left|\right|a$, $M$ does not exhibit a distinct anomaly at $T_C$. The results indicate that below $T_C$, ${\text{Ce}}_3$${\text{RuSn}}_6$ has a non-collinear magnetic structure and that the magnetic moments are aligned in the bc-plane.