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강상관계 물질 연구단
강상관계 물질 연구단
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Strong spin-phonon coupling unveiled by coherent phonon oscillations in Ca2RuO4

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Title
Strong spin-phonon coupling unveiled by coherent phonon oscillations in Ca2RuO4
Author(s)
Min-Cheol Lee; Choong H. Kim; Inho Kwak; C. W. Seo; Changhee Sohn; F. Nakamura; C. Sow; Y. Maeno; E.-A. Kim; T. W. Noh; K. W. Kim
Publication Date
2019-04
Journal
PHYSICAL REVIEW B, v.99, no.14, pp.144306 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 American Physical Society. We utilize near-infrared femtosecond pulses to investigate coherent phonon oscillations of Ca2RuO4. The coherent Ag phonon mode of the lowest frequency changes abruptly not only its amplitude but also the oscillation phase as the spin order develops. In addition, the phonon mode shows a redshift entering the magnetically ordered state, which indicates a spin-phonon coupling in the system. Density functional theory calculations reveal that the Ag oscillations result in octahedral tilting distortions, which are exactly in sync with the lattice deformation driven by the magnetic ordering. We suggest that the structural distortions by the spin-phonon coupling can induce the unusual oscillation phase shift between impulsive and displacive type oscillations
URI
https://pr.ibs.re.kr/handle/8788114/6472
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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