http://www.css-physics.edu.pl We provide the proof for the 5 D term origin of an excited triplet observed in the recent electron-spin-resonance (ESR) experiments by Noguchi et al. (Phys. Rev. B 66, 094404 (2002)). We have succeeded to fully describe experimental ESR results both for the zero-field g-factor, of 3.35, and the splitting D of 4.90 cm −1 , as well as for the magnetic field applied along different crystallographic directions within the localized electron atomic-like approach as originating from excitations within the lowest triplet of the 5 T 2g octahedral subterm of the 5 D term. In our atomic-like approach the d electrons of the Co 3+ ion in LaCoO 3 form the highly-correlated atomic-like 3d 6 system with the singlet 1 A 1 ground state (an octahedral subterm of the 1 I term) and the excited octahedral 5 T 2g subterm of the 5 D term. We take the ESR experiment as confirmation of the existence of the discrete electronic structure for 3d electron states in LaCoO 3 on the meV scale.

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