Abstract
We present detailed studies on the phonon branches in rhombohedral La 0.8Sr 0.2MnO 3 and La 0.7Sr 0.3MnO 3 by means of inelastic neutron scattering and model calculations. Most of the phonon data are well reproduced by a shell model including screening by nearly free carriers to account for the metallic character of the compounds. Anomalous features were observed in the high-frequency branches with breathing and quadrupolar character which probably reflect a tendency for a Jahn–Teller instability and charge ordering.
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