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강상관계 물질 연구단
강상관계 물질 연구단
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Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4

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Title
Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4
Author(s)
Min-Cheol Lee; Choong Hyun Kim; Inho Kwak; J. Kim; S. Yoon; Byung Cheol Park; Bumjoo Lee; F. Nakamura; C. Sow; Y. Maeno; Tae Won Noh; Kyungwan Kim
Publication Date
2018-10
Journal
PHYSICAL REVIEW B, v.98, no.16, pp.161115-1 - 161115-5
Publisher
AMER PHYSICAL SOC
Abstract
We employ an optical pump-probe technique to study coherent phonon oscillations in Ca2RuO4. We find that oscillation amplitude of an Ag symmetric phonon mode is strongly suppressed at 260 K, a putative transition point of orbital ordering. The oscillation also shows a gradual but huge change in its phase, such that the oscillation even flips over with a 180 change across the temperature. Density functional theory calculations indicate that the Ag phonon has an eigenmode of octahedral distortion with conventional tilting along the a axis and antipolar distortion of apical oxygen. Careful inspection of the lattice captures an unusually large antipolar distortion in low-temperature structures, which may play a crucial role for the phase transition at 260 K. ©2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5137
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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