Ulrich C, Ament L J P, Ghiringhelli G, Braicovich L, Moretti Sala M, Pezzotta N, Schmitt T, Khaliullin G, van den Brink J, Roth H, Lorenz T, Keimer B
Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany.
Phys Rev Lett. 2009 Sep 4;103(10):107205. doi: 10.1103/PhysRevLett.103.107205.
High-resolution resonant inelastic x-ray scattering has been used to determine the momentum dependence of orbital excitations in Mott-insulating LaTiO(3) and YTiO(3) over a wide range of the Brillouin zone. The data are compared to calculations in the framework of lattice-driven and superexchange-driven orbital ordering models. A superexchange model in which the experimentally observed modes are attributed to two-orbiton excitations yields the best description of the data.
高分辨率共振非弹性X射线散射已被用于确定莫特绝缘体LaTiO₃和YTiO₃中轨道激发在布里渊区广泛范围内的动量依赖性。将这些数据与晶格驱动和超交换驱动的轨道有序模型框架下的计算结果进行了比较。一个超交换模型，其中实验观察到的模式归因于双轨道子激发，对数据给出了最佳描述。
