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Hybridization and electron-phonon coupling in ferroelectric BaTiO3 probed by resonant inelastic x-ray scattering

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Fatale Sara, Moser Simon, Miyawaki Jun, Harada Yoshihisa, Grioni Marco,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 94
Page(s) 195131
Title of proceedings Physical Review B

Open Access

URL https://infoscience.epfl.ch/record/225353?ln=en
Type of Open Access Repository (Green Open Access)

Abstract

We investigated the ferroelectric perovskite material BaTiO3 by resonant inelastic x-ray scattering (RIXS) at the Ti L3 edge. We observe with decreasing temperature a transfer of spectral weight from the elastic to the charge-transfer spectral features, indicative of increasing Ti 3d-O 2p hybridization. When the incident photon energy selects transitions to the Ti 3d eg manifold, the quasielastic RIXS response exhibits a tail indicative of phonon excitations. A fit of the spectral line shape by a theoretical model allows us to estimate the electron-phonon coupling strength M ∼ 0.25 eV, which places BaTiO3 in the intermediate coupling regime.
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