Wang Ru Pan, Elnaggar Hebatalla, Titus Charles J, Tomiyasu Keisuke, Geessinck Jaap, Koster Gertjan, Frati Federica, Okamoto Jun, Huang Di Jing, de Groot Frank M F
Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands.
Department of Physics, Stanford University, Stanford, CA 94305, USA.
J Synchrotron Radiat. 2020 Jul 1;27(Pt 4):979-987. doi: 10.1107/S1600577520005123. Epub 2020 Jun 9.
Angle-dependent 2p3d resonant inelastic X-ray scattering spectra of a LaCoO single crystal and a 55 nm LaCoO film on a SrTiO substrate are presented. Theoretical calculation shows that, with ∼20 meV resolved Co 2p3d resonant inelastic X-ray scattering (RIXS), the excited states of the isotropic A(O) ground state are split by 3d spin-orbit coupling, which can be distinguished via their angular dependence. However, strong self-absorption and saturation effects distort the spectra of the LaCoO single crystal and limit the observation of small angular dependence. In contrast, the RIXS on 55 nm LaCoO shows less self-absorption effects and preserves the angular dependence of the excited states.
给出了LaCoO单晶以及生长在SrTiO衬底上的55 nm LaCoO薄膜的角度相关2p3d共振非弹性X射线散射光谱。理论计算表明，通过约20 meV分辨率的Co 2p3d共振非弹性X射线散射（RIXS），各向同性A(O)基态的激发态被3d自旋轨道耦合分裂，可通过其角度依赖性加以区分。然而，强自吸收和饱和效应使LaCoO单晶的光谱发生畸变，并限制了对小角度依赖性的观测。相比之下，55 nm LaCoO上的RIXS表现出较小的自吸收效应，并保留了激发态的角度依赖性。
