Resonant inelastic x-ray scattering study of Ca3Ru2O7
Journal article, 2020
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.
Author
K. von Arx
University of Zürich
F. Forte
University of Salerno
SPIN CNR Institute - Salerno
M. Horio
University of Zürich
V Granata
University of Salerno
Q. Wang
University of Zürich
L. Das
University of Zürich
Yasmine Sassa
Chalmers, Physics, Materials Physics
R. Fittipaldi
SPIN CNR Institute - Salerno
University of Salerno
C. G. Fatuzzo
National Research Council of Italy (CNR)
University of Zürich
Swiss Federal Institute of Technology in Lausanne (EPFL)
O. Ivashko
Deutsches Elektronen-Synchrotron (DESY)
University of Zürich
Y. Tseng
Paul Scherrer Institut
E. Paris
Paul Scherrer Institut
A. Vecchione
SPIN CNR Institute - Salerno
University of Salerno
T. Schmitt
Paul Scherrer Institut
M. Cuoco
University of Salerno
SPIN CNR Institute - Salerno
J. Chang
University of Zürich
Physical Review B
2469-9950 (ISSN) 2469-9969 (eISSN)
Vol. 102 23 235104Realization of Novel Low‐Dimensional Skyrmion Systems
Swedish Research Council (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevB.102.235104