Infrared probe of spin-phonon coupling in antiferromagnetic honeycomb lattice compound Li2MnO3

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Title
Infrared probe of spin-phonon coupling in antiferromagnetic honeycomb lattice compound Li2MnO3
Author(s)
Seungjae Song; Sanghyun Lee; Seyoung Jeon; Je-Geun Park; Moon, S.J.
Publication Date
2015-12
Journal
JOURNAL OF PHYSICS-CONDENSED MATTER, v.27, no.48, pp.485604 -
Publisher
IOP PUBLISHING LTD
Abstract
We investigated temperature-dependent infrared-active phonon modes of honeycomb Li2MnO3 which shows an antiferromagnetic transition at T N = 36 K. In the far-infrared frequency region, we observed fourteen phonon modes. We obtained the temperature dependence of each phonon mode from the analysis of optical conductivity spectra by using the Lorentz and the Fano-type oscillator models. We found that the resonance frequencies of nine phonon modes showed an anomalous behavior near T N that should be attributed to the spin-phonon coupling. We calculated the magnitude of the spin-phonon coupling constant from the shift in the resonance frequencies of the phonon modes below T N. Our results suggest that Li2MnO3 is weakly frustrated and that spin-phonon coupling plays a role in antiferromagnetic ordering. © 2015 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/1825
ISSN
0953-8984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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