Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-01-06
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 9 figures, to be published in J. Low. Temp. Physics
Scientific paper
10.1063/1.2171521
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.
Barilo S.
Bychkov G.
Choi Ki-Young
Fomin V.
Gnezdilov Vladimir
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