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Orbital-resolved spin-exchange interactions and spin-phonon coupling in
Phys. Rev. Research 7, 043189 – Published 20 November, 2025
DOI: https://doi.org/10.1103/kxbt-1nbq
Abstract
This report investigates the role of orbital degrees of freedom in , focusing on orbital-driven spin-exchange interactions and spin-phonon coupling through both experiments and first-principles calculations. Combining synchrotron radiation x-ray powder diffraction, Raman spectroscopy, and x-ray absorption fine structure measurements, a significant correlation between magnetic transition and structural modification was identified, revealing spin-lattice coupling at the transition (). This coupling is linked to conventional magnetoelastic interactions, even active above , supported by both experimental and theoretical findings. The calculations revealed crystal field splitting and orbital nondegeneracy resulting from charge transfer in the system of due to octahedral symmetry breaking. The study discusses the detailed mechanism of orbital-resolved spin-exchange interactions, leading to one-dimensional A-type antiferromagnetic ordering. Notably, no significant orbital-selective spin-phonon coupling was observed at approximately 200 K () in , in contrast to earlier studies [A. P. Roy et al., Phys. Rev. Lett. 132, 026701 (2024)]. These findings advance the understanding of the fundamental physics in and significantly contribute to the field of spin-orbital-lattice physics in transition metal oxides.
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