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Resonant inelastic x-ray scattering study of Ca3Ru2O7


von Arx, K; Forte, F; Horio, M; Granata, V; Wang, Q; Das, L; Sassa, Y; Fittipaldi, R; Fatuzzo, C G; Ivashko, O; Tseng, Y; Paris, E; Vecchione, A; Schmitt, T; Cuoco, M; Chang, J (2020). Resonant inelastic x-ray scattering study of Ca3Ru2O7. Physical review B, 102(23):235104.

Abstract

We present a combined oxygen K-edge x-ray absorption spectroscopy and resonant inelastic x-ray scattering (RIXS) study of the bilayer ruthenate Ca3Ru2O7. Our RIXS experiments on Ca3Ru2O7 were carried out on the overlapping planar and interplanar oxygen resonances, which are distinguishable from the apical one. Comparison to equivalent oxygen K-edge spectra recorded on band-Mott insulating Ca2RuO4 is made. In contrast to Ca2RuO4 spectra, which contain excitations linked to Mott physics, Ca3Ru2O7 spectra feature only intra-t2g ones that do not directly involve the Coulomb energy scale. As found in Ca2RuO4, we resolve two intra-t2g excitations in Ca3Ru2O7. Moreover, the lowest lying excitation in Ca3Ru2O7 shows a significant dispersion, revealing a collective character different from what is observed in Ca2RuO4. Theoretical modeling supports the interpretation of this lowest energy excitation in Ca3Ru2O7 as a magnetic transverse mode with multiparticle character, whereas the corresponding excitation in Ca2RuO4 is assigned to combined longitudinal and transverse spin modes. These fundamental differences are discussed in terms of the inequivalent magnetic ground-state manifestations in Ca2RuO4 and Ca3Ru2O7.

Abstract

We present a combined oxygen K-edge x-ray absorption spectroscopy and resonant inelastic x-ray scattering (RIXS) study of the bilayer ruthenate Ca3Ru2O7. Our RIXS experiments on Ca3Ru2O7 were carried out on the overlapping planar and interplanar oxygen resonances, which are distinguishable from the apical one. Comparison to equivalent oxygen K-edge spectra recorded on band-Mott insulating Ca2RuO4 is made. In contrast to Ca2RuO4 spectra, which contain excitations linked to Mott physics, Ca3Ru2O7 spectra feature only intra-t2g ones that do not directly involve the Coulomb energy scale. As found in Ca2RuO4, we resolve two intra-t2g excitations in Ca3Ru2O7. Moreover, the lowest lying excitation in Ca3Ru2O7 shows a significant dispersion, revealing a collective character different from what is observed in Ca2RuO4. Theoretical modeling supports the interpretation of this lowest energy excitation in Ca3Ru2O7 as a magnetic transverse mode with multiparticle character, whereas the corresponding excitation in Ca2RuO4 is assigned to combined longitudinal and transverse spin modes. These fundamental differences are discussed in terms of the inequivalent magnetic ground-state manifestations in Ca2RuO4 and Ca3Ru2O7.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:1 December 2020
Deposited On:16 Dec 2020 15:47
Last Modified:16 Dec 2020 15:55
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Closed
Publisher DOI:https://doi.org/10.1103/physrevb.102.235104
Project Information:
  • : FunderSNSF
  • : Grant IDCRSII2_160765
  • : Project TitleMott Physics Beyond the Heisenberg Model in Iridates and Related Materials
  • : FunderSNSF
  • : Grant IDCRSII2_141962
  • : Project TitleMott Physics Beyond the Heisenberg Model in Iridates and Related Materials

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