Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.6: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
Orbitons and bi-orbitons in GdVO3 and YVO3 observed by RIXS — •Luis Mäder1, Komalavalli Thirunavukkuarasu1, Eva Benckiser2,1, Giacomo Ghiringhelli3, Marco Moretti3, Graeme R. Blake4, Nandang Mufti4, Agung A. Nugroho5,4, Thomas T. M. Palstra4, Maurits Haverkort2, Thorsten Schmitt6, and Markus Grüninger1 — 1Universität zu Köln — 2MPI-FKF Stuttgart — 3Politecnico di Milano — 4University of Groningen — 5Institut Teknologi Bandung — 6PSI, Villigen
In an orbitally ordered state, one expects that exchange interactions between orbitals on neighbouring sites give rise to a novel kind of elementary excitations, so called orbitons, which are analogous to spin waves in a magnetically ordered state.
Here, we report on the observation of orbital excitations in YVO3 and GdVO3 by means of high-resolution resonant inelastic x-ray scattering (RIXS) across the V L3,2 (V 2p → V 3d) and O K (O 1s → O 2p) edges with the new SAXES beamline at the PSI, Villigen.
Due to the excellent resolution of 60 meV, we are able to resolve two different features in the low energy regime. We interpret them as one- and bi-orbiton excitations in good agreement with our optical data [1]. We compare our data with results on YTiO3 and LaTiO3 by Ulrich et al. [2], who attribute the spectral weight at low energies mainly to bi-orbiton excitations.
[1] E. Benckiser et al., New J. Phys. 10, 053027 (2008).
[2] C. Ulrich et al., PRL 103, 107205 (2009).