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Spin-lattice entanglement in
Phys. Rev. B 112, 214435 – Published 16 December, 2025
DOI: https://doi.org/10.1103/nbp7-glqj
Abstract
Complex chalcogenides in the family of materials (, Fe, Co, and Ni) display remarkably different phase progressions depending upon the metal center orbital filling, character of the P–P linkage, and size of the van der Waals gap. There is also a stacking pattern and spin-state difference between the “lighter” and “heavier” transition-metal-containing systems that places at the nexus of these activities. Despite these unique properties, this compound is underexplored. Here, we bring together Raman scattering spectroscopy and infrared absorption spectroscopy with x-ray techniques to identify a structural component to the 119 K magnetic ordering transition. With temperature-dependent Raman scattering, we discover a set of magnon-phonon pairs that engages in avoided crossings below . These findings point to strong spin-phonon entanglement as well as opportunities to control these effects under external stimuli.
Physics Subject Headings (PhySH)
Corrections
15 January, 2026
Correction: A typographical error in the email address of the byline footnote for the last author has been fixed.