We reveal in this study the fundamental low-energy landscape in the ferrimagnetic Sr2CrReO6 double perovskite and describe the underlying mechanisms responsible for the three low-energy excitations below 1.4 eV. Based on resonant inelastic x-ray scattering and magnetic dynamics calculations, and experiments collected from both Sr2CrReO6 powders and epitaxially strained thin films, we reveal a strong competition between spin-orbit coupling, Hund's coupling, and the strain-induced tetragonal crystal field. We also demonstrate that a spin-flip process is at the origin of the lowest excitation at 200 meV, and we bring insights into the predicted presence of orbital ordering in this material. We study the nature of the magnons through a combination of ab initio and spin-wave theory calculations, and show that two nondegenerate magnon bands exist and are dominated either by rhenium or chromium spins. The rhenium band is found to be flat at about 200 meV (±25 meV) through X-L-W-U high-symmetry points and is dispersive toward Γ
@article{arxiv.2310.11585,
title = {Low-energy electronic interactions in ferrimagnetic Sr2CrReO6 thin films},
author = {Guillaume Marcaud and Alex Taekyung Lee and Adam J. Hauser and F. Y. Yang and Sangjae Lee and Diego Casa and Mary Upton and Thomas Gog and Kayahan Saritas and Yilin Wang and Mark P. M. Dean and Hua Zhou and Zhan Zhang and F. J. Walker and Ignace Jarrige and Sohrab Ismail-Beigi and Charles Ahn},
journal= {arXiv preprint arXiv:2310.11585},
year = {2023}
}