Evidence of structural evolution in Sr2RhO4 studied by time-resolved optical reflectivity spectroscopy

Min-Cheol Lee; Inho Kwak; Choong H. Kim; Bumjoo Lee; Byung Chul Park; Junyoung Kwon; Wonshik Kyung; Changyoung Kim; Tae Won Noh; Kyungwan Kim

doi:10.1103/PhysRevB.100.235139

Evidence of structural evolution in Sr2RhO4 studied by time-resolved optical reflectivity spectroscopy

Strongly Correlated Electrons 2019-12-30 v1

Authors: Min-Cheol Lee , Inho Kwak , Choong H. Kim , Bumjoo Lee , Byung Chul Park , Junyoung Kwon , Wonshik Kyung , Changyoung Kim , Tae Won Noh , Kyungwan Kim

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Abstract

We investigate ultrafast dynamics from photoinduced reflectivity of Sr2RhO4 by using femtosecond near-infrared pulses. We observe a clear temperature-dependent anomaly in its electronic dynamics which slows down below 160 K. In addition, coherent oscillations of the A1g symmetric 5.3-THz phonon exhibit a 90-degree shift in its initial phase across TS, indicating a structural change in octahedral rotation distortions. We propose that octahedral structure in Sr2RhO4 evolves at around TS, and it can influence on the non-equilibrium dynamics of photoinduced carriers as well as real-time phonon responses.

Keywords

phonon physics phase transitions phonon modes and lattice dynamics

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@article{arxiv.1908.04479,
  title  = {Evidence of structural evolution in Sr2RhO4 studied by time-resolved optical reflectivity spectroscopy},
  author = {Min-Cheol Lee and Inho Kwak and Choong H. Kim and Bumjoo Lee and Byung Chul Park and Junyoung Kwon and Wonshik Kyung and Changyoung Kim and Tae Won Noh and Kyungwan Kim},
  journal= {arXiv preprint arXiv:1908.04479},
  year   = {2019}
}

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5 pages, 3 figures

Evidence of structural evolution in Sr2RhO4 studied by time-resolved optical reflectivity spectroscopy

Abstract

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