Universität zu Köln

Benckiser, E., Fels, L., Ghiringhelli, G., Sala, M. Moretti, Schmitt, T., Schlappa, J., Strocov, V. N., Mufti, N., Blake, G. R., Nugroho, A. A., Palstra, T. T. M., Haverkort, M. W., Wohlfeld, K. and Grueninger, M. (2013). Orbital superexchange and crystal field simultaneously at play in YVO3: Resonant inelastic x-ray scattering at the V L edge and the O K edge. Phys. Rev. B, 88 (20). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report on the observation of orbital excitations in YVO3 by means of resonant inelastic x-ray scattering (RIXS) at energies across the vanadium L-3 and oxygen K absorption edges. At the V L3 edge, we are able to resolve the full spectrum of orbital excitations up to 5 eV. In order to unravel the effect of superexchange interactions and the crystal field on the orbital excitations, we analyzed the energy and temperature dependence of the intra-t(2g) excitations at 0.1-0.2 eV in detail. While these results suggest a dominant influence of the crystal field, peak shifts of about 13-20 meV observed as a function of the transferred momentum q parallel to a reflect a finite dispersion of the orbital excitations. This is puzzling since theoretical models based on superexchange interactions predict a dispersion only for q parallel to c. Furthermore, we demonstrate that RIXS at the O K edge is very sensitive to intersite excitations. At the O K edge, we observe excitations across the Mott-Hubbard gap and an additional feature at 0.4 eV, which we attribute to two-orbiton scattering, i.e., an exchange of orbitals between adjacent sites. Altogether, our results indicate that both superexchange interactions and the crystal field are important for a quantitative understanding of the orbital excitations in YVO3.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Benckiser, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fels, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ghiringhelli, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sala, M. Moretti UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmitt, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlappa, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strocov, V. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mufti, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blake, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nugroho, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palstra, T. T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haverkort, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wohlfeld, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-472000
DOI:	10.1103/PhysRevB.88.205115
Journal or Publication Title:	Phys. Rev. B
Volume:	88
Number:	20
Date:	2013
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION-METAL OXIDES; EMISSION-SPECTROSCOPY; ELECTRONIC-STRUCTURE; SPIN; EXCITATIONS; PHYSICS; STATES Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47200