In Lanthanum manganate perovskite, we assign particular phonon mode as Jahn-Teller phonon mode. What do we mean by that, whether there is something related to crystal field splitting or that particular mode belongs to some energy gap?
Jahn-Teller Raman mode is a type of vibrational mode that is observed in molecules that contain a non-linear component. This mode arises from the distortion of the molecule due to the Jahn-Teller effect, which is caused by the unequal spacing of the electrons in the outermost shell of the molecule. The Jahn-Teller Raman mode is usually characterized by a single, intense peak in the Raman spectrum. This peak is caused by the large displacement amplitudes of the atoms in the molecule that are involved in the distortion.
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