Abstract
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 $4.90{\mathrm{cm}}^{\ensuremath{-}1},$ as well as for the magnetic field applied along different crystallographic directions within the localized electron atomiclike approach as originating from excitations within the lowest triplet of the ${}^{5}{T}_{2g}$ octahedral subterm of the ${}^{5}D$ term. In our atomiclike approach the d electrons of the ${\mathrm{Co}}^{3+}$ ion in ${\mathrm{LaCoO}}_{3}$ form the highly correlated atomiclike system ${3d}^{6}$ with the singlet ground state ${}^{1}{A}_{1}$ (an octahedral subterm of the ${}^{1}I$ term) and the excited octahedral subterm ${}^{5}{T}_{2g}$ 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 ${\mathrm{LaCoO}}_{3}$ in the meV scale.
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