标题： 无限层镍酸镧LaNiO$_2$的晶格动力学 显示英文标题

标题： Lattice dynamics of the infinite-layer nickelate LaNiO$_2$

摘要： 无限层（IL）镍酸盐迅速成为一类新的超导体。 然而，由于其拓扑合成的技术挑战，它们迄今为止主要以薄膜或多晶粉末样品的形式实现，限制了对诸如晶格动力学等基本物理性质的全面研究。 在此，我们对由大量共取向的块体晶体组成的IL镍酸盐LaNiO$_2$样品进行了飞行时间非弹性中子散射研究。 我们观察到几个色散声子分支，这与基于密度泛函微扰理论的晶格动力学计算结果良好一致。 此外，我们将选定的LaNiO$_2$声子模式特性与同结构的铜氧化物超导体进行比较。 我们的发现为未来实验和理论研究提供了参考点，旨在理解IL镍酸盐中晶格动力学与电子性质之间的相互作用。 显示英文摘要

摘要： Infinite-layer (IL) nickelates have rapidly emerged as a new class of superconductors. However, due to the technical challenges of their topotactic synthesis, they have so far been realized primarily as thin films or polycrystalline powder samples, limiting comprehensive investigations of fundamental physical properties such as the lattice dynamics. Here, we present a time-of-flight inelastic neutron scattering study on a sample composed of a large number of co-aligned bulk crystals of the IL nickelate LaNiO$_2$. We observe several dispersive phonon branches, which are in good agreement with lattice dynamical calculations based on density-functional perturbation theory. In addition, we compare the characteristics of selected LaNiO$_2$ phonon modes to those of isostructural cuprate superconductors. Our findings provide a reference point for future experimental and theoretical efforts aimed at understanding the interplay between lattice dynamics and electronic properties in IL nickelates.