Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.76: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Looking for orbiton dispersion features in GdVO3 with the aim of RIXS — •Pasquale Marra1, Krzysztof Wohlfeld1, Jeroen van den Brink1, Luis Maeder2, Komalavalli Thirunavukkuarasu2, Marco Moretti Sala3, Giacomo Ghiringhelli3, Thorsten Schmitt4, and Marcus Grueninger2 — 1IFW Dresden — 2Universität zu Köln — 3Politecnico di Milano — 4PSI Villigen
We compute the theoretical RIXS spectra for the dd excitations at the vanadium L3 edge in GdVO3, as a function of energy and momentum transfer, by factorizing the RIXS spectral function into two parts: (i) a single-site part with a core hole present and (ii) a lattice part without the core hole. The obtained results are compared with the direct measurements on the compound for four different angles, carried out with SAXES at the ADDRESS beamline (PSI Villigen, Switzerland). The experimental spectra show a shoulder at low energy with a clearly visible shift corresponding to different momentum transfers. We investigate the possible origin of this shift, in order to distinguish between a crystal field effect (weight transfer between two or more different peaks) and an orbiton dispersion feature predicted by the superexchange mechanism for 3d2 degenerate electrons in V3+ ions.