Universal orbital and magnetic structures in infinite-layer nickelates
Universal orbital and magnetic structures in infinite-layer nickelates
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DOI：
10.1103/physrevb.109.024512
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发表时间：
2023-12
影响因子：
3.7
通讯作者：
M. Rossi;H. Lu;K. Lee;B. H. Goodge;J. Choi;M. Osada;Y. Lee;D. Li;B. Wang;D. Jost;S. Agrestini;M. Garcia-Fernandez;Z. Shen;K. Zhou;E. Been;B. Moritz;L. Kourkoutis;T. Devereaux;H. Y. Hwang;W. S. Lee
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文献类型：
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作者：
M. Rossi;H. Lu;K. Lee;B. H. Goodge;J. Choi;M. Osada;Y. Lee;D. Li;B. Wang;D. Jost;S. Agrestini;M. Garcia-Fernandez;Z. Shen;K. Zhou;E. Been;B. Moritz;L. Kourkoutis;T. Devereaux;H. Y. Hwang;W. S. Lee
我们用共振非弹性X射线散射(RIXS)对稀土无限层镍酸盐薄膜RNiO2(R=La，Pr，和Nd)进行了比较研究。我们发现，轨道构型的总体特征基本上是相同的，只是细节杂交略有不同。对于低能激发，我们毫不含糊地确认在所有三个化合物中都存在阻尼磁激发。通过对线性自旋波理论的拟合，提取了可比较的自旋交换耦合强度和阻尼系数，表明无限大层镍酸盐具有普遍的磁结构。有趣的是，虽然LaNiO2在RIXS谱的准弹性区观察到了电荷有序的特征，但在NdNiO2和PrNiO2中没有。这促使人们进一步研究无限层镍酸盐中电荷有序的普适性和起源。
We conducted a comparative study of the rare-earth infinite-layer nickelates films, RNiO2 (R = La, Pr, and Nd) using resonant inelastic X-ray scattering (RIXS). We found that the gross features of the orbital configurations are essentially the same, with minor variations in the detailed hybridization. For low-energy excitations, we unambiguously confirm the presence of damped magnetic excitations in all three compounds. By fitting to a linear spin-wave theory, comparable spin exchange coupling strengths and damping coefficients are extracted, indicating a universal magnetic structure in the infinite-layer nickelates. Interestingly, while signatures of a charge order are observed in LaNiO2 in the quasi-elastic region of the RIXS spectrum, it is absent in NdNiO2 and PrNiO2. This prompts further investigation into the universality and the origins of charge order within the infinite-layer inickelates.