Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Spin Systems and Itinerant Magnets
TT 14.9: Vortrag
Dienstag, 27. März 2007, 16:30–16:45, H19
Resonant Inelastic X-ray Scattering at the O 1s Resonance of Transition Metal Monoxides — •Thorsten Schmitt1, Laurent Duda2, Vladimir Strocov1, Martin Magnuson2, Johan Forsberg2, Anders Olsson2, Joseph Nordgren2, Kozo Okada3, and Akio Kotani4 — 1Swiss Light Source, Paul Scherrer Institut, Villigen PSI, Switzerland — 2Department of Physics, Uppsala University, Uppsala, Sweden — 3The Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan — 4RIKEN/Spring8, Hyogo, Japan
Resonant inelastic x-ray scattering (RIXS) is a powerful tool for determining the energy and symmetry of charge neutral electronic excitations in strongly correlated materials. We report on high-resolution polarization-dependent RIXS at the O 1s resonance of NiO [1], CoO and MnO. The experimental results are compared to multi-site cluster calculations, which are able to describe collective excitations. Tuning the incident X-ray energy to the first absorption peak excites the O 1s electron into empty O 2p states strongly hybridized with the metal 3d states. Thus the de-excitation process reveals contributions from low-energy excitations mediated by the O 1s core-hole. Apart from local oxygen ligand to metal charge transfer excitations and local crystal field excitations, the O 1s RIXS spectra give also rise to non-local metal-to-metal charge transfer excitations and double inter-site spin flip excitations (double-singlet creation).
[1] L.-C. Duda, T. Schmitt, M. Magnuson et al., Phys. Rev. Lett. 96, 067402 (2006).