We provide a novel experimental method to quantitatively estimate the electron-phonon coupling and its momentum dependence from resonant inelastic x-ray scattering (RIXS) spectra based on the detuning of the incident photon energy away from an absorption resonance. We apply it to the cuprate parent compound NdBa2Cu3O6 and find that the electronic coupling to the oxygen half-breathing phonon mode is strongest at the Brillouin zone boundary, where it amounts to ∼0.17 eV, in agreement with previous studies. In principle, this method is applicable to any absorption resonance suitable for RIXS measurements and will help to define the contribution of lattice vibrations to the peculiar properties of quantum materials.
@article{arxiv.1902.09163,
title = {Experimental Determination of Momentum-Resolved Electron-Phonon Coupling},
author = {Matteo Rossi and Riccardo Arpaia and Roberto Fumagalli and Marco Moretti Sala and Davide Betto and Gabriella M. De Luca and Kurt Kummer and Jeroen van den Brink and Marco Salluzzo and Nicholas B. Brookes and Lucio Braicovich and Giacomo Ghiringhelli},
journal= {arXiv preprint arXiv:1902.09163},
year = {2019}
}