Abnormal $phase$ flip in coherent phonon oscillations of Ca$_2$RuO$_4$

@inproceedings{Lee2018AbnormalF,
  title={Abnormal \$phase\$ flip in coherent phonon oscillations of Ca\$_2\$RuO\$_4\$},
  author={Minju Lee and Choong Hyun Kim and Inho Kwak and Jangho Kim and Sung-Min Yoon and Byung Cheol Park and Bumjoo Lee and Fumihiko Nakamura and Chanchal Sow and Yoshiteru Maeno and Tae Won Noh and Kun Woo Kim},
  year={2018}
}
  • Minju Lee, Choong Hyun Kim, +9 authors Kun Woo Kim
  • Published 2018
  • Physics
  • We employ an optical pump-probe technique to study coherent phonon oscillations in Ca$_2$RuO$_4$. 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$^{\circ}$ change across the temperature. Density functional theory calculations indicate that the $A_g$ phonon has an eigenmode… CONTINUE READING

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