论文标题
KCES2 Delafossite中的自旋波动力学：粉末弹性中子散射数据的理论描述
Spin-wave dynamics in the KCeS2 delafossite: A theoretical description of powder inelastic neutron-scattering data
论文作者
论文摘要
分层的稀有地球delafoss $ arx_2 $，$ r $ = yb（iii）或ce（iii），作为量子旋转式基态的潜在宿主，已经引起了很大的兴趣。该家族的某些系统没有显示长期订单，以至于最低的温度，例如Naybo $ _2 $，Naybs $ _2 $和Naybse $ _2 $，被认为处于量子旋转状态。然而，已知其他同一结构化合物在亚kelvin温度下以抗铁磁为单位。其中，KCES $ _2 $在三角形飞机上展示了条纹-Yz $磁性订单，该飞机设置为400 mk以下。在这里，我们研究了使用粉末非弹性中子散射的这个有序阶段的自旋波谱，并使用基于完整的$ | j，m_j \ rangle $多重组的CE站点的模型hamiltonian使用模型哈密顿计算获得，并用各向异性的最近neighter-Neighbor交换互动描述。将当前对系统中交换相互作用的理解与粉末中的纹理作用，我们能够以高忠诚度对非弹性中子中子散射频谱进行建模。
Layered rare-earth delafossites $ARX_2$ with $R$ = Yb(III) or Ce(III) have received a lot of interest as potential hosts for a quantum spin-liquid ground state. Some systems of this family that show no long-range order down to the lowest measured temperatures, such as NaYbO$_2$, NaYbS$_2$, and NaYbSe$_2$, are presumed to be in a quantum spin-liquid state. However, other isostructural compounds are known to order antiferromagnetically at subkelvin temperatures. Among them, KCeS$_2$ exhibits stripe-$yz$ magnetic order in the triangular-lattice planes that sets in below 400 mK. Here we investigate the spin-wave spectrum of this ordered phase with powder inelastic neutron scattering and describe it using a model Hamiltonian obtained from first-principles calculations based on the complete $|J,m_J\rangle$ multiplet description of the Ce sites with an anisotropic nearest-neighbor exchange interaction. Combing the current understanding of the exchange interaction in the systems with the effects of texturing in the powder, we have been able to model the inelastic neutron scattering spectrum with high fidelity.
