Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO2

Sándor Tóth (), Björn Wehinger, Katharina Rolfs, Turan Birol, Uwe Stuhr, Hiroshi Takatsu, Kenta Kimura, Tsuyoshi Kimura, Henrik M. Rønnow and Christian Rüegg
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Sándor Tóth: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
Björn Wehinger: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
Katharina Rolfs: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute
Turan Birol: University of Minnesota
Uwe Stuhr: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
Hiroshi Takatsu: Graduate School of Engineering, Kyoto University
Kenta Kimura: Graduate School of Engineering Science, Osaka University
Tsuyoshi Kimura: Graduate School of Engineering Science, Osaka University
Henrik M. Rønnow: Laboratory for Quantum Magnetism, Institute of Physics, EPFL
Christian Rüegg: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Inelastic X-ray scattering with meV energy resolution (IXS) is an ideal tool to measure collective excitations in solids and liquids. In non-resonant scattering condition, the cross-section is strongly dominated by lattice vibrations (phonons). However, it is possible to probe additional degrees of freedom such as magnetic fluctuations that are strongly coupled to the phonons. The IXS spectrum of the coupled system contains not only the phonon dispersion but also the so far undetected magnetic correlation function. Here we report the observation of strong magnon–phonon coupling in LiCrO2 that enables the measurement of magnetic correlations throughout the Brillouin zone via IXS. We find electromagnon excitations and electric dipole active two-magnon excitations in the magnetically ordered phase and heavily damped electromagnons in the paramagnetic phase of LiCrO2. We predict that several (frustrated) magnets with dominant direct exchange and non-collinear magnetism show surprisingly large IXS cross-section for magnons and multi-magnon processes.

Date: 2016
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DOI: 10.1038/ncomms13547

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