Authors
Alsu Ivashko, Taishun Manjo, Maximilian Kauth, Yuliia Tymoshenko, Adrian M Merritt, Klaus-Peter Bohnen, Rolf Heid, Michael Merz, Andreas Eich, John-Paul Castellan, Alexandre Ivanov, Nathaniel Schreiber, Hong Zheng, J F Mitchell, Martin Meven, Jitae T Park, Daisuke Ishikawa, Yuiga Nakamura, Alfred Q R Baron, Frank Weber
Published in
Physical review letters. Volume 137. Issue 11. Pages 116101. Sep 11, 2026.
Abstract
We investigate lattice dynamics in LaCoO_{3} using inelastic neutron and x-ray scattering over T=2-650 K, spanning the spin-state crossover at T_{1}≈100 K and the insulator-metal transition at T_{2}≈550 K. Comparison with quasiharmonic ab initio lattice-dynamical calculations helps reveal anomalous softening of a≈10-meV oxygen phonon, confined to the temperature interval T_{1}≤T≤T_{2} and localized in momentum space at q_{SSO}=(½,½,½)_{c}. This wave vector is characteristic of the spin-state-ordering pattern originally proposed by Goodenough [An interpretation of the magnetic properties of the perovskite-type mixed crystals La_{1-x}Sr_{x}CoO_{3-λ}, J. Phys. Chem. Solids 6, 287 (1958)JPCSAW0022-369710.1016/0022-3697(58)90107-0]. Our results provide momentum-resolved evidence for dynamic correlations of high-spin and low-spin Co^{3+} states characterized by q_{SSO}=(½,½,½)_{c}, demonstrating that phonons are sensitive probes of fluctuating spin-state correlations in LaCoO_{3}.
PMID:
42789915
Bibliographic data and abstract were imported from PubMed on 26 Sep 2026.
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