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Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4

Title
Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4
Authors
Lee, Min-CheolKim, Choong H.Kwak, InhoKim, J.Yoon, S.Park, Byung CheolLee, BumjooNakamura, F.Sow, C.Maeno, Y.Noh, T. W.Kim, K. W.
Ewha Authors
윤석현
SCOPUS Author ID
윤석현scopus
Issue Date
2018
Journal Title
PHYSICAL REVIEW B
ISSN
2469-9950JCR Link

2469-9969JCR Link
Citation
PHYSICAL REVIEW B vol. 98, no. 16
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We employ an optical pump-probe technique to study coherent phonon oscillations in Ca2RuO4. We find that oscillation amplitude of an A(g) 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.
DOI
10.1103/PhysRevB.98.161115
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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