Evolution of the phonon density of states of LaCoO3 over the spin state transition

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.83.214305· OSTI ID:1018638

Golosova, N. O. ^[1]; Kozlenko, D. P. ^[1]; Kolesnikov, Alexander I ^[2]; Kazimirov, V. Yu. ^[1]; Smirnov, M. B. ^[3]; Jirak, Z. ^[4]; Savenko, B. N. ^[1]

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1. Joint Institute for Nuclear Research, Dubna, Russia
2. ORNL
3. St. Petersburg State University, St. Petersburg, Russia
4. Institute of Physics, Czech Republic

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1018638
• Journal Information: Physical Review B, Vol. 83, Issue 21; ISSN 1098--0121
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BENDING
NEUTRONS
PHONONS
RESPIRATION
SCATTERING
SPECTRA
SPIN