dd excitations in three-dimensional q-space

• Verfasst von: Hiraoka, Nozomu [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: dd excitations in three-dimensional q-space
• Titelzusatz: a nonresonant inelastic X-ray scattering study on NiO
• Verf.angabe: N. Hiraoka, M. Suzuki, K.D. Tsuei, H. Ishii, Y.Q. Cai, M.W. Haverkort, C.C. Lee and W. Ku
• Fussnoten: Gesehen am 07.11.2017
• Titel Quelle: Enthalten in: epl
• Jahr Quelle: 2011
• Band/Heft Quelle: 96(2011,3) Artikel-Nummer 37007, 5 Seiten
• ISSN Quelle: 1286-4854
• DOI: doi:10.1209/0295-5075/96/37007
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564965651

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.