Crystal Field-Phonon Coupling in ErFeO3 Single Crystal Via Inelastic Neutron Scattering
Abstract
Crystal-field (CF) excitations and their coupling to lattice vibrations were investigated in ErFeO3 using inelastic neutron scattering. Pronounced modifications of the excitation spectra, including energy shifts, intensity redistribution, and linewidth changes, were observed as a consequence of CF-phonon coupling. Significant renormalization of the first and second CF excitations, located near 5 meV and 12 meV, respectively, was detected along both transverse and longitudinal directions in the vicinity of the reciprocal-space point Q = (2, 0, 4). The coupling effects become more prominent as the temperature increases from 300 K to 650 K, while a slight suppression is observed at 750 K. Remarkably, CF excitation peaks that are strongly weakened by thermal population effects re-emerge in specific momentum regions through interaction with phonon modes. The coupled excitations exhibit characteristic signatures of hybridization, including energy renormalization, intensity enhancement, and linewidth narrowing. Density-functional-theory-based phonon calculations further support the interpretation of CF-phonon coupling in ErFeO3. These results demonstrate that strong interactions between CF excitations and lattice vibrations can substantially modify the excitation spectra in rare-earth orthoferrites.
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BibTeX
@misc{deng2026crystal,
title = {{Crystal Field-Phonon Coupling in ErFeO$_3$ Single Crystal Via Inelastic Neutron Scattering}},
author = {Guochu Deng and Xiaoxuan Ma and Wanting Yang and Wei Ren and Shixun Cao and Zhenxiang Cheng and Garry J. McIntyre},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.23015},
eprint = {2610.23015},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.23015},
}
RIS
TY - UNPB
TI - Crystal Field-Phonon Coupling in ErFeO_3 Single Crystal Via Inelastic Neutron Scattering
AU - Guochu Deng
AU - Xiaoxuan Ma
AU - Wanting Yang
AU - Wei Ren
AU - Shixun Cao
AU - Zhenxiang Cheng
AU - Garry J. McIntyre
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2610.23015
UR - https://arxiv.org/abs/2610.23015
AB - Crystal-field (CF) excitations and their coupling to lattice vibrations were investigated in ErFeO_3 using inelastic neutron scattering. Pronounced modifications of the excitation spectra, including energy shifts, intensity redistribution, and linewidth changes, were observed as a consequence of CF-phonon coupling. Significant renormalization of the first and second CF excitations, located near 5 meV and 12 meV, respectively, was detected along both transverse and longitudinal directions in the vicinity of the reciprocal-space point Q = (2, 0, 4). The coupling effects become more prominent as the temperature increases from 300 K to 650 K, while a slight suppression is observed at 750 K. Remarkably, CF excitation peaks that are strongly weakened by thermal population effects re-emerge in specific momentum regions through interaction with phonon modes. The coupled excitations exhibit characteristic signatures of hybridization, including energy renormalization, intensity enhancement, and linewidth narrowing. Density-functional-theory-based phonon calculations further support the interpretation of CF-phonon coupling in ErFeO3. These results demonstrate that strong interactions between CF excitations and lattice vibrations can substantially modify the excitation spectra in rare-earth orthoferrites.
ER -