Evidence for the excited triplet of Co3+ in LaCoO3

S. Noguchi; S. Kawamata; K. Okuda; H. Nojiri; M. Motokawa

doi:10.1103/PhysRevB.66.094404

Evidence for the excited triplet of Co³⁺ in LaCoO₃

S. Noguchi, S. Kawamata, K. Okuda, H. Nojiri, M. Motokawa

Institute for Materials Research (IMR) (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

171 Citations (Scopus)

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
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	https://doi.org/10.1103/PhysRevB.66.094404
Publication status	Published - 2002 Sep 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.66.094404

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title = "Evidence for the excited triplet of Co3+ in LaCoO3",

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.",

author = "S. Noguchi and S. Kawamata and K. Okuda and H. Nojiri and M. Motokawa",

year = "2002",

month = sep,

day = "1",

doi = "10.1103/PhysRevB.66.094404",

language = "English",

volume = "66",

pages = "944041--944045",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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publisher = "American Institute of Physics Publising LLC",

number = "9",

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TY - JOUR

T1 - Evidence for the excited triplet of Co3+ in LaCoO3

AU - Noguchi, S.

AU - Kawamata, S.

AU - Okuda, K.

AU - Nojiri, H.

AU - Motokawa, M.

PY - 2002/9/1

Y1 - 2002/9/1

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.66.094404

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JO - Physical Review B - Condensed Matter and Materials Physics

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SN - 0163-1829

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Evidence for the excited triplet of Co³⁺ in LaCoO₃

Abstract

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