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Low temperature mixed spin state of Co3+ in LaCoO3 evidenced from Jahn-Teller lattice distortions

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.

preprint2006arXivOpen access
V. GnezdilovK. -Y. ChoiYu. PashkevichP. LemmensS. ShiryaevG. BychkovS. BariloV. FominA. V. Yeremenko
cond-mat.str-elcond-mat.mtrl-sci
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Open access9 authors2 topics
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V. GnezdilovK. -Y. ChoiYu. PashkevichP. LemmensS. ShiryaevG. BychkovS. BariloV. FominA. V. Yeremenko

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