dd excitations in three-dimensional q-Space: A nonresonant inelastic X-ray scattering study on NiO

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Title:	dd excitations in three-dimensional q-Space: A nonresonant inelastic X-ray scattering study on NiO
Authors:	N. Hiraoka;Suzuki, M.;Tsuei, K. D.;Ishii, H.;Cai, Y. Q.;Haverkort, M. W.;Lee, C. C.;Ku, W.
Date:	2011-10-17
Issue Date:	2019-10-15 12:11:00 (UTC+8)
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.
Relation:	Europhysics Letters(EPL) 96(3), 37007
DOI:	10.1209/0295-5075/96/37007
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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