Raman study of the orbital-phonon coupling in LaCoO3

Raman study of the orbital-phonon coupling in LaCoO3

The magnetic state in LaCoO3 changes from the low spin state (S=0) to the mixed state with a thermally excited intermediate spin state (IS) (S=1) above about 50 K. The partially filled e(g) orbital in the IS state has a nature of Jahn-Teller (JT) distortion. The cooperative JT distortion causes an o...

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Veröffentlicht in:Physical review letters 2004-09, Vol.93 (13), p.136401.1-136401.4
Hauptverfasser: ISHIKAWA, A, NOHARA, J, SUGAI, S
Format: Artikel
Sprache:eng
Schlagworte:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Physics
Polarons and electron-phonon interactions
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Zusammenfassung:The magnetic state in LaCoO3 changes from the low spin state (S=0) to the mixed state with a thermally excited intermediate spin state (IS) (S=1) above about 50 K. The partially filled e(g) orbital in the IS state has a nature of Jahn-Teller (JT) distortion. The cooperative JT distortion causes an orbital order. We found that all Raman active phonon modes are affected by the excitation of IS Co3+ ions. Especially, the JT vibration mode shows anomalous temperature dependence.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.136401