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Commensurate charge-density wave with frustrated interchain coupling in SmNiC_2

机译:SmNiC_2中具有受阻链间耦合的等效电荷密度波

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Temperature-dependent x-ray diffraction on SmNiC2 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_(CDW)=148 K and in the ferromagnetically ordered state below T_c=17.7 K. The modulated crystal structure has been determined for the incommensurate CDW state with q_(CDW) = (0.5,0.516,0) at T=60 K. The observed atomic modulation displacements indicate that the CDW should be considered as a commensurate CDW centered on chains of Ni atoms along a. Frustrated interchain coupling is responsible for the incommensurability of the three-dimensionally ordered CDW state.
机译:在SmNiC2上随温度变化的X射线衍射表明,该化合物的正交晶格对称性一直持续到至少9 K的温度,即进入T_(CDW)= 148以下的电荷密度波(CDW)状态。 K且处于T_c = 17.7 K以下的铁磁有序状态。已确定在T = 60 K时q_(CDW)=(0.5,0.516,0)的不对称CDW状态的调制晶体结构。观察到的原子调制位移表明CDW应该被认为是以a上的Ni原子链为中心的相称CDW。链间耦合失败是造成三维有序CDW状态不可通约性的原因。

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