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Anomalous optical phonons in FeTe chalcogenides: Spin state, magnetic order, and lattice anharmonicity
Physical Review B
Polarized Raman-scattering spectra of non-superconducting, single-crystalline FeTe are investigated as function of temperature. We have found a relation between the magnitude of ordered magnetic moments and the linewidth of A1g phonons at low temperatures. This relation is attributed to the intermediate spin state (S=1) and the orbital degeneracy of the Fe ions. Spin-phonon coupling constants have been estimated based on microscopic modeling using density-functional theory and analysis of thedoi:10.1103/physrevb.83.245127 fatcat:ibxzjr3cuvhcrnu5z5ha36rywy