Low-temperature mixed spin state of Co3+in LaCo O3 evidenced from Jahn-Teller lattice distortions

V. Gnezdilov; V. Fomin; A. V. Yeremenko; K. Y. Choi; Yu Pashkevich; P. Lemmens; S. Shiryaev; G. Bychkov; S. Barilo

doi:10.1063/1.2171521

Low-temperature mixed spin state of Co³⁺in LaCo O₃ evidenced from Jahn-Teller lattice distortions

V. Gnezdilov
, V. Fomin
, A. V. Yeremenko
, K. Y. Choi
, Yu Pashkevich
, P. Lemmens
, S. Shiryaev
, G. Bychkov
, S. Barilo

NASU - B. Verkin Institute for Low Temperature Physics and Engineering
Tohoku University
NASU - Donetsk Institute for Physics and Engineering
Technical University of Braunschweig
Belarus Academy of Sciences

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

One-phonon and multiphonon excitations of the single-crystalline LaCo O3 were studied using Raman spectroscopy in the temperature region 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 the 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.

Original language	English
Pages (from-to)	162-168
Number of pages	7
Journal	Low Temperature Physics
Volume	32
Issue number	2
DOIs	https://doi.org/10.1063/1.2171521
State	Published - Feb 2006
Externally published	Yes

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title = "Low-temperature mixed spin state of Co3+in LaCo O3 evidenced from Jahn-Teller lattice distortions",

abstract = "One-phonon and multiphonon excitations of the single-crystalline LaCo O3 were studied using Raman spectroscopy in the temperature region 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 the 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.",

author = "V. Gnezdilov and V. Fomin and Yeremenko, \{A. V.\} and Choi, \{K. Y.\} and Yu Pashkevich and P. Lemmens and S. Shiryaev and G. Bychkov and S. Barilo",

year = "2006",

month = feb,

doi = "10.1063/1.2171521",

language = "English",

volume = "32",

pages = "162--168",

journal = "Low Temperature Physics",

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TY - JOUR

T1 - Low-temperature mixed spin state of Co3+in LaCo O3 evidenced from Jahn-Teller lattice distortions

AU - Gnezdilov, V.

AU - Fomin, V.

AU - Yeremenko, A. V.

AU - Choi, K. Y.

AU - Pashkevich, Yu

AU - Lemmens, P.

AU - Shiryaev, S.

AU - Bychkov, G.

AU - Barilo, S.

PY - 2006/2

Y1 - 2006/2

N2 - One-phonon and multiphonon excitations of the single-crystalline LaCo O3 were studied using Raman spectroscopy in the temperature region 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 the 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.

AB - One-phonon and multiphonon excitations of the single-crystalline LaCo O3 were studied using Raman spectroscopy in the temperature region 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 the 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.

UR - https://www.scopus.com/pages/publications/33744961805

U2 - 10.1063/1.2171521

DO - 10.1063/1.2171521

M3 - Article

AN - SCOPUS:33744961805

SN - 1063-777X

VL - 32

SP - 162

EP - 168

JO - Low Temperature Physics

JF - Low Temperature Physics

IS - 2

ER -

Low-temperature mixed spin state of Co³⁺in LaCo O₃ evidenced from Jahn-Teller lattice distortions

Abstract

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