Abstract
The state excited from the ground singlet of Co3+ in LaCoO3 was investigated by submillimeter-wave electron spin resonance (ESR) measurements. Clear ESR signals with zero-field splitting were observed above 20 K for the first time. The activation energy is estimated to be △≈140 K, from the temperature dependence of the signal intensity and the resonance-width. The frequency and angular dependence of the signals were successfully analyzed by an effective spin-Hamiltonian with uniaxial anisotropy. The parameters obtained are g∥=3.35, g⊥=3.55, and D=+4.90 cm-1 for the effective spin S= 1. The results reveal that the first excited state is a triplet with a zero-field splitting of Co3+ in LaCoO3.
Original language | English |
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Article number | 094404 |
Pages (from-to) | 944041-944045 |
Number of pages | 5 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 66 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2002 Sep 1 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics