One-phonon and multiphonon excitations of the single-crystalline La Co O 3 were studied
using Raman spectroscopy in the temperature region 5–300 K⁠. First-order Raman spectra
show a larger number of phonon modes than allowed for the rhombohedral structure.
Additional phonon modes are interpreted in terms of activated modes due to lattice
distortions, arising from the Jahn–Teller (JT) activity of the intermediate-spin (IS) state of the
Co 3+ ions. In particular, the 608-cm− 1 stretching-type mode shows anomalous behavior in …

One-and multi-phonon excitations of the single crystalline LaCoO₃ were studied using
Raman spectroscopy in the temperature region of 5–300 K. First-order Raman spectra show
a larger number of phonon modes than allowed for the rhombohedral structure. Additional
phonon modes are interpreted in terms of activated modes due to lattice distortions, arising
from the Jahn–Teller (JT) activity of the intermediate-spin (IS) state of Co³⁺ ions. In
particular, the 608-cm⁻ ¹ stretching-type mode shows anomalous behavior in peak energy …