Abstract
Temperature-dependent x-ray diffraction on ${\text{SmNiC}}_{2}$ has shown that the orthorhombic lattice symmetry of this compound persist down to a temperature of at least 9 K, i.e., into the charge-density-wave (CDW) state below ${T}_{\text{CDW}}=148\text{ }\text{K}$ and in the ferromagnetically ordered state below ${T}_{C}=17.7\text{ }\text{K}$. The modulated crystal structure has been determined for the incommensurate CDW state with ${\mathbf{q}}_{\text{CDW}}=(0.5,0.516,0)$ at $T=60\text{ }\text{K}$. The observed atomic modulation displacements indicate that the CDW should be considered as a commensurate CDW centered on chains of Ni atoms along $\mathbf{a}$. Frustrated interchain coupling is responsible for the incommensurability of the three-dimensionally ordered CDW state.
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