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Inelastic neutron scattering study of phonons and magnetic excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>LaCoO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
We have investigated the phonon and the magnetic excitations in ${\mathrm{LaCoO}}_{3}$ by inelastic neutron scattering measurements. The acoustic phonon dispersions show some characteristic features of the folded Brillouin zone (BZ) for the rhombohedrally distorted perovskite structure containing two chemical formula units of ${\mathrm{LaCoO}}_{3}$ in the unit cell. We observed two …