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

被引：14
作者：
Gnezdilov, V
Fomin, V
Yeremenko, AV
Choi, KY
Pashkevich, Y
Lemmens, P
Shiryaev, S
Bychkov, G
Barilo, S
机构：
[1] Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] Natl Acad Sci Ukraine, Galkin Donetsk Phys Tech Inst, UA-83114 Donetsk, Ukraine
[4] TU Braunschweig, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany
[5] Acad Sci Minsk, Inst Phys Solids & Semicond, Minsk 220072, BELARUS
来源：
LOW TEMPERATURE PHYSICS | 2006年 / 32卷 / 02期
关键词：
D O I：
10.1063/1.2171521
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
One-phonon and multiphonon excitations of the single-crystalline LaCoO3 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.
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页码：162 / 168
页数：7
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