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Low temperature mixed spin state of Co3+ in LaCoO3 evidenced from Jahn-Teller lattice distortions | | V. Gnezdilov
; K.-Y. Choi
; Yu. Pashkevich
; P. Lemmens
; S. Shiryaev
; G. Bychkov
; S. Barilo
; V. Fomin
; A.V. Yeremenko
; | | Date: |
6 Jan 2006 | | Subject: | Strongly Correlated Electrons; Materials Science | | Abstract: | One- and multi-phonon excitations of the single crystalline LaCoO3 were studied using Raman spectroscopy in the temperature region of 5 K - 300 K. First-order Raman spectra show a larger number of phonon modes than allowed for the rhombohedral structure. Additional phonon modes are interpreted in terms of activated modes due to lattice distortions, arising from the Jahn-Teller (JT) activity of the intermediate-spin (IS) state of Co3+ ions. In particular, the 608-cm-1 stretching-type mode shows anomalous behavior in peak energy and scattering intensity as a function of temperature. The anomalous temperature dependence of the second-order phonon excitations spectra is in accordance with the Franck-Condon mechanism that is characteristic for a JT orbital order. | | Source: | arXiv, cond-mat/0601121 | | Services: | Forum | Review | PDF | Favorites | |
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