Incommensurate-Commensurate Magnetic Phase Transition in SmRu${}_2$Al${}_{10}$

Abstract

Magnetic properties of single crystalline SmRu${}_2$Al${}_{10}$ have been investigated by electrical resistivity, magnetic susceptibility, and specific heat. We have confirmed the successive magnetic phase transitions at $T_{\text{N}}=12.3$ K and $T_{\text{M}}=5.6$ K. Resonant x-ray diffraction has also been performed to study the magnetic structures. Below $T_{\text{N}}$, the Sm${}^{3+}$ moments order in an incommensurate structure with $q_1=(0,0.759,0)$. The magnetic moments are oriented along the orthorhombic $b$ axis, which coincides with the magnetization easy axis in the paramagnetic phase. A very weak third harmonic peak is also observed at $q_3=(0,0.278,0)$. The transition at $T_{\text{M}}$ is a lock-in transition to the commensurate structure described by $q_1=(0,0.75,0)$. A well developed third harmonic peak is observed at $q_3=(0,0.25,0)$. From the discussion of the magnetic structure, we propose that the long-range RKKY interaction plays an important role, in addition to the strong nearest neighbor antiferromagnetic interaction.

11 pages, 12 figures, accepted in PRB

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