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

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 5–300 K. First-order Raman spectra show a larger number of phonon modes than allowed for the rhombohedral structure. Additional phonon modes are interpreted in ter...

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Datum:2006
Hauptverfasser: Gnezdilov, V., Choi, K.-Y., Pashkevich, Yu., Lemmens, P., Shiryaev, S., Bychkov, G., Barilo, S., Fomin, V., Yeremenko, A.V.
Format: Artikel
Sprache:English
Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
Schriftenreihe:Физика низких температур
Schlagworte:
Динамика кристаллической решетки
Online Zugang:https://nasplib.isofts.kiev.ua/handle/123456789/120131
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Zitieren:Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions / V. Gnezdilov, K.-Y. Choi, Yu. Pashkevich, P. Lemmens, S. Shiryaev, G. Bychkov, S. Barilo, V. Fomin, A.V. Yaremenko // Физика низких температур. — 2006. — Т. 32, № 2. — С. 219-226. — Бібліогр.: 38 назв. — англ.

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spelling nasplib_isofts_kiev_ua-123456789-1201312025-02-09T11:47:13Z Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions Gnezdilov, V. Choi, K.-Y. Pashkevich, Yu. Lemmens, P. Shiryaev, S. Bychkov, G. Barilo, S. Fomin, V. Yeremenko, A.V. Динамика кристаллической решетки 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. This work was supported by INTAS Grant ¹01-0278, NATO Collaborative Linkage Grant PST.CLG.977766 and DFG through SPP1073. 2006 Article Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions / V. Gnezdilov, K.-Y. Choi, Yu. Pashkevich, P. Lemmens, S. Shiryaev, G. Bychkov, S. Barilo, V. Fomin, A.V. Yaremenko // Физика низких температур. — 2006. — Т. 32, № 2. — С. 219-226. — Бібліогр.: 38 назв. — англ. 0132-6414 PACS: 71.70.Ej, 63.20.Kr, 78.30.Hv https://nasplib.isofts.kiev.ua/handle/123456789/120131 en Физика низких температур application/pdf Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Динамика кристаллической решетки
Динамика кристаллической решетки
spellingShingle Динамика кристаллической решетки
Динамика кристаллической решетки
Gnezdilov, V.
Choi, K.-Y.
Pashkevich, Yu.
Lemmens, P.
Shiryaev, S.
Bychkov, G.
Barilo, S.
Fomin, V.
Yeremenko, A.V.
Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
Физика низких температур
description 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.
format Article
author Gnezdilov, V.
Choi, K.-Y.
Pashkevich, Yu.
Lemmens, P.
Shiryaev, S.
Bychkov, G.
Barilo, S.
Fomin, V.
Yeremenko, A.V.
author_facet Gnezdilov, V.
Choi, K.-Y.
Pashkevich, Yu.
Lemmens, P.
Shiryaev, S.
Bychkov, G.
Barilo, S.
Fomin, V.
Yeremenko, A.V.
author_sort Gnezdilov, V.
title Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
title_short Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
title_full Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
title_fullStr Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
title_full_unstemmed Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions
title_sort low temperature mixed spin state of co³⁺ in lacoo₃ evidenced from jahn–teller lattice distortions
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2006
topic_facet Динамика кристаллической решетки
url https://nasplib.isofts.kiev.ua/handle/123456789/120131
citation_txt Low temperature mixed spin state of Co³⁺ in LaCoO₃ evidenced from Jahn–Teller lattice distortions / V. Gnezdilov, K.-Y. Choi, Yu. Pashkevich, P. Lemmens, S. Shiryaev, G. Bychkov, S. Barilo, V. Fomin, A.V. Yaremenko // Физика низких температур. — 2006. — Т. 32, № 2. — С. 219-226. — Бібліогр.: 38 назв. — англ.
series Физика низких температур
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first_indexed 2025-11-25T22:33:24Z
last_indexed 2025-11-25T22:33:24Z
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