Resonant inelastic x-ray scattering study of Ca3Ru2O7
Artikel i vetenskaplig tidskrift, 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.

Författare

K. von Arx

Universität Zürich

F. Forte

Universita degli Studi di Salerno

SPIN CNR Institute - Salerno

M. Horio

Universität Zürich

V Granata

Universita degli Studi di Salerno

Q. Wang

Universität Zürich

L. Das

Universität Zürich

Yasmine Sassa

Chalmers, Fysik, Materialfysik

R. Fittipaldi

SPIN CNR Institute - Salerno

Universita degli Studi di Salerno

C. G. Fatuzzo

Consiglio Nazionale delle Ricerche (CNR)

Universität Zürich

Ecole Polytechnique Federale de Lausanne (EPFL)

O. Ivashko

Deutsches Elektronen-Synchrotron (DESY)

Universität Zürich

Y. Tseng

Paul Scherrer Institut

E. Paris

Paul Scherrer Institut

A. Vecchione

SPIN CNR Institute - Salerno

Universita degli Studi di Salerno

T. Schmitt

Paul Scherrer Institut

M. Cuoco

Universita degli Studi di Salerno

SPIN CNR Institute - Salerno

J. Chang

Universität Zürich

PHYSICAL REVIEW B

2469-9950 (ISSN) 2469-9969 (eISSN)

Vol. 102 23 235104

Framtidens Lågdimensionella Skyrmion Material

Vetenskapsrådet (VR), 2019-06-01 -- 2021-12-31.

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.102.235104

Mer information

Senast uppdaterat

2020-12-17