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

Автор(и)

  • V. Gnezdilov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • K.-Y. Choi Institute for Material Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
  • Yu. Pashkevich A. Galkin Donetsk Physico-Technical Institute of the National Academy of Sciences of Ukraine 72 R. Luksemburg Str., Donetsk 83114, Ukraine
  • P. Lemmens Institute for Physics of Condensed Matter, TU Braunschweig, Braunschweig D-38106, Germany
  • S. Shiryaev Institute of Physics of Solids & Semiconductors, Academy of Sciences, Minsk 220072, Belarus
  • G. Bychkov Institute of Physics of Solids & Semiconductors, Academy of Sciences, Minsk 220072, Belarus
  • S. Barilo Institute of Physics of Solids & Semiconductors, Academy of Sciences, Minsk 220072, Belarus
  • V. Fomin B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.V. Yeremenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.2171521

Ключові слова:

lanthanum cobalt oxide, mixed spin state, Jahn–Teller lattice distortions, phonons

Анотація

One- and multi-phonon excitations of the single crystalline LaCoO3 were studied using Raman spectroscopy in the temperature region of 5–300 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.

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Опубліковано

2005-12-23

Як цитувати

(1)
Gnezdilov, V.; Choi, K.-Y.; Pashkevich, Y.; Lemmens, P.; Shiryaev, S.; Bychkov, G.; Barilo, S.; Fomin, V.; Yeremenko, A. Low Temperature Mixed Spin State of Co3+ in LaCoO3 Evidenced from Jahn-Teller Lattice Distortions. Fiz. Nizk. Temp. 2005, 32, 219-226.

Номер

Том 32 № 2 (2006)

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