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• W2080619526 abstract "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 transverse optical (TO) phonon branches along $(ensuremath{delta}phantom{rule{0.3em}{0ex}}ensuremath{delta}phantom{rule{0.3em}{0ex}}ensuremath{delta})$, consistent with previously reported Raman active ${E}_{g}$ modes which show remarkable softening associated with the spin-state transition [Ishikawa et al., Phys. Rev. Lett. 93, 136401 (2004)]. We found that the softening takes place in the TO mode over the whole BZ. In contrast, the acoustic phonons show no anomalous softening associated with the spin-state transition. The low-energy paramagnetic scattering at 8 K is weak, increasing towards a maximum at $Eensuremath{gtrsim}15phantom{rule{0.3em}{0ex}}mathrm{meV}$, consistent with excitation of the nonmagnetic low-spin to magnetic intermediate-spin state of ${mathrm{Co}}^{3+}$ ions." @default.
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• W2080619526 date "2005-11-01" @default.
• W2080619526 modified "2023-10-16" @default.
• W2080619526 title "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>" @default.
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• W2080619526 doi "https://doi.org/10.1103/physrevb.72.174405" @default.
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