Abstract
Phonons and magnons in La 2NiO 4 were investigated by Raman scattering. This crystal shows sequential structural phase transitions, HTT(580 K)LTO 1(73 K)LTO 2. The observation of soft modes relating to the structural phase transitions revealed a mixing of LTO 1 and LTO 2 structures. This phase mixing increases a structural disturbance and might cause carrier localization. The decrease of residual carrier density is also observed in the increase of two-magnon peak intensity in LTO 2. The observation of multi-phonon scattering up to the fifth order in spite of the off resonant condition with the charge transfer excitation indicates that this resonant scattering is induced through Frank-Condon Raman polarizability and resonantly excited electronic states are localized mid-gap states with anharmonic vibrational potentials - possibly phonon polaronic states.
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