Resonant inelastic x-ray scattering study of Ca3Ru2O7

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-t(2g) ones that do not directly involve the Coulomb energy scale. As found in Ca2RuO4, we resolve two intra-t(2g) 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.

Forte, F.Universita degli Studi di Salerno,University of Salerno,SPIN CNR Institute - Salerno (author)
Horio, M.Universität Zürich,University of Zürich (author)
Granata, VUniversita degli Studi di Salerno,University of Salerno (author)
Wang, Q.Universität Zürich,University of Zürich (author)
Das, L.Universität Zürich,University of Zürich (author)
Sassa, Yasmine,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sassa (author)
Fittipaldi, R.SPIN CNR Institute - Salerno,Universita degli Studi di Salerno,University of Salerno (author)
Fatuzzo, C. G.Consiglio Nazionale delle Ricerche (CNR),National Research Council of Italy (CNR),Universität Zürich,University of Zürich,Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL) (author)
Ivashko, O.Deutsches Elektronen-Synchrotron (DESY),Universität Zürich,University of Zürich (author)
Tseng, Y.Paul Scherrer Institut (author)
Paris, E.Paul Scherrer Institut (author)
Vecchione, A.SPIN CNR Institute - Salerno,Universita degli Studi di Salerno,University of Salerno (author)
Schmitt, T.Paul Scherrer Institut (author)
Cuoco, M.Universita degli Studi di Salerno,University of Salerno,SPIN CNR Institute - Salerno (author)
Chang, J.Universität Zürich,University of Zürich (author)
Universität ZürichUniversita degli Studi di Salerno (creator_code:org_t)

By the author/editor: von Arx, K.; Forte, F.; Horio, M.; Granata, V; Wang, Q.; Das, L.; show more...; Sassa, Yasmine, ...; Fittipaldi, R.; Fatuzzo, C. G.; Ivashko, O.; Tseng, Y.; Paris, E.; Vecchione, A.; Schmitt, T.; Cuoco, M.; Chang, J.; show less...

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