Intertwined complex orbital order and ferrimagnetism in honeycomb molybdate Fe2Mo3O8
Abstract
Motivated by the recent experimental interest in honeycomb molybdates A2Mo3O8, we return and develop the minimal models to capture the essential physics for Fe2Mo3O8. It is pointed out that, the magnetism in these materials arises from the mutual induction between the spin-orbit coupling of the tetrahedral sublattice with active orbitals and the superexchange with the spins from the octahedral sublattice. Essentially, the superexchange between the tetrahedral and octahedral sublattices directly drives the ferrimagnetism, and the residual spin-orbit coupling on the tetrahedral sublattice induces the complex orbital order. The hybrid magnon-phonon excitations are further explored together with their resulting Berry curvatures and thermal Hall effect. We discuss the experimental relevance with Fe2Mo3O8, and the framework can be extended to FeNiMo3O8, Ni2Mo3O8 and other isostructural magnets.
Related
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BibTeX
@misc{song2026intertwined,
title = {{Intertwined complex orbital order and ferrimagnetism in honeycomb molybdate Fe$_2$Mo$_3$O$_8$}},
author = {Hong-Hao Song and Gang v. Chen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29729},
eprint = {2610.29729},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29729},
}
RIS
TY - UNPB
TI - Intertwined complex orbital order and ferrimagnetism in honeycomb molybdate Fe_2Mo_3O_8
AU - Hong-Hao Song
AU - Gang v. Chen
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.29729
UR - https://arxiv.org/abs/2610.29729
AB - Motivated by the recent experimental interest in honeycomb molybdates A_2Mo_3O_8, we return and develop the minimal models to capture the essential physics for Fe_2Mo_3O_8. It is pointed out that, the magnetism in these materials arises from the mutual induction between the spin-orbit coupling of the tetrahedral sublattice with active orbitals and the superexchange with the spins from the octahedral sublattice. Essentially, the superexchange between the tetrahedral and octahedral sublattices directly drives the ferrimagnetism, and the residual spin-orbit coupling on the tetrahedral sublattice induces the complex orbital order. The hybrid magnon-phonon excitations are further explored together with their resulting Berry curvatures and thermal Hall effect. We discuss the experimental relevance with Fe_2Mo_3O_8, and the framework can be extended to FeNiMo_3O_8, Ni_2Mo_3O_8 and other isostructural magnets.
ER -