Resonant inelastic x-ray scattering study of Ca3Ru2O7

K. von Arx, F. Forte, M. Horio, V. Granata, Q. Wang, L. Das, Y. Sassa, R. Fittipaldi, C. G. Fatuzzo, O. Ivashko, Y. Tseng, E. Paris, A. Vecchione, T. Schmitt, M. Cuoco, and J. Chang
Phys. Rev. B 102, 235104 – Published 1 December 2020

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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  • Received 27 April 2020
  • Revised 5 August 2020
  • Accepted 11 November 2020

DOI:https://doi.org/10.1103/PhysRevB.102.235104

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

K. von Arx1,*, F. Forte2,3, M. Horio1, V. Granata3, Q. Wang1, L. Das1, Y. Sassa4, R. Fittipaldi2,3, C. G. Fatuzzo5,1,†, O. Ivashko1,‡, Y. Tseng6, E. Paris6, A. Vecchione2,3, T. Schmitt6, M. Cuoco2,3, and J. Chang1,§

  • 1Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
  • 2CNR-SPIN, I-84084 Fisciano, Salerno, Italy
  • 3Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
  • 4Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
  • 5Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • 6Swiss Light Source, Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

  • *karin.vonarx@uzh.ch
  • Present address: Istituto di Scienze del Patrimonio Culturale, Consiglio Nazionale delle Ricerche (ISPC-CNR), Via Biblioteca 4, 95124 Catania, Italy.
  • Present address: Deutsches Elektronen-Synchrotron DESY 22607 Hamburg, Germany.
  • §johan.chang@physik.uzh.ch

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Issue

Vol. 102, Iss. 23 — 15 December 2020

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