Evolution of the phonon density of states of LaCoO.sub.3./sub. over the spin state transition

0364248 - FZÚ 2012 RIV US eng J - Journal Article
Golosova, N.O. - Kozlenko, D. P. - Kolesnikov, A.I. - Kazimirov, V.Y. - Smirnov, M. B. - Jirák, Zdeněk - Savenko, B. N.
Evolution of the phonon density of states of LaCoO₃ over the spin state transition.
Physical Review. B. Roč. 83, č. 21 (2011), "214305-1"-"214305-6". ISSN 1098-0121
Institutional research plan: CEZ:AV0Z10100521
Keywords : first-principles theory * spin crossover
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.691, year: 2011

The phonon spectra of LaCoO3 were studied by inelastic neutron scattering in the temperature range of 4–120 K. The DFT calculations of the lattice dynamics have been made for interpretation of the experimental data. The observed and calculated phonon frequencies were found to be in a reasonable agreement. The evolution of the phonon density of states over the spin state transition was analyzed. In the low-temperature range (T < 50 K), an increase in the energy of resolved breathing, stretching, and bending phonon modes was found, followed by their softening and broadening at higher temperatures due to the spin state transition and relevant orbital-phonon coupling.
Permanent Link: http://hdl.handle.net/11104/0199775