Orbital superexchange and crystal field simultaneously at play in YVO 3: resonant inelastic x-ray scattering at V L edge and the O K edge
We report on the observation of orbital excitations in YVO3 by means of resonant inelastic x-ray scattering (RIXS) at energies across the vanadium L3 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 e...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
13 November 2013
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| In: |
Physical review. B, Condensed matter and materials physics
Year: 2013, Volume: 88, Issue: 20, Pages: 205115 |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.88.205115 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.88.205115 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.88.205115 
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| Author Notes: | E. Benckiser, L. Fels, G. Ghiringhelli, M. Moretti Sala, T. Schmitt, J. Schlappa, V.N. Strocov, N. Mufti, G.R. Blake, A.A. Nugroho, T.T.M. Palstra, M.W. Haverkort, K. Wohlfeld, and M. Grüninger |
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| 245 | 1 | 0 | |a Orbital superexchange and crystal field simultaneously at play in YVO 3 |b resonant inelastic x-ray scattering at V L edge and the O K edge |c E. Benckiser, L. Fels, G. Ghiringhelli, M. Moretti Sala, T. Schmitt, J. Schlappa, V.N. Strocov, N. Mufti, G.R. Blake, A.A. Nugroho, T.T.M. Palstra, M.W. Haverkort, K. Wohlfeld, and M. Grüninger |
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| 520 | |a We report on the observation of orbital excitations in YVO3 by means of resonant inelastic x-ray scattering (RIXS) at energies across the vanadium L3 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-t2g 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∥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∥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. | ||
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