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Title dd excitations in three-dimensional q-space: A nonresonant inelastic X-ray scattering study on NiO
Author N. Hiraoka, M. Suzuki, K. D. Tsuei, H. Ishii, Y. Q. Cai, M. W. Haverkort, C. C. Lee, W. Ku
Abstract We have studied the dd excitations in NiO over three-dimensional momentum (q) space using nonresonant inelastic X-ray scattering. In addition to the previously reported peaks at 1.7 and 3.0 eV, another peak is found at 1.0 eV, with a dramatically different intensity distribution in momentum space.Contrary to the other two peaks that form oval structures maximizing at [111] directions, the 1.0 eV peak displays appreciable intensity along low-symmetry axes near [311] and [210], but vanishes in the three principal axes [100], [110], and [111], indicating a significant difference in the exciton wave function.We find good agreement between the experimental data and two state-of-the-art theories, advocating investigating other strongly correlated materials with similar experimental/theoretical approaches.
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