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

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 TS∼160 K. In addition, coherent oscillations of the 5.3 THz A1g phonon exhibit a 9...

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Bibliographic Details
Published in:Physical review. B 2019-12, Vol.100 (23), p.1
Main Authors: Lee, Min-Cheol, Kwak, Inho, Kim, Choong H, Lee, Bumjoo, Park, Byung Cheol, Kwon, Junyoung, Kyung, Wonshik, Kim, Changyoung, Noh, Tae Won, Kim, Kyungwan
Format: Article
Language:English
Subjects:
Femtosecond pulses
Phonons
Reflectance
Temperature dependence
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Summary: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 TS∼160 K. In addition, coherent oscillations of the 5.3 THz A1g phonon exhibit a 90∘ shift in its initial phase across TS, indicating a structural change in octahedral rotation distortions. We propose that octahedral structure in Sr2RhO4 evolves around TS, and it can influence the nonequilibrium dynamics of photo-induced carriers as well as realtime phonon responses.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.235139