Evidence of structural evolution in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RhO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> studied by time-resolved optical reflectivity spectroscopy

Min‐Cheol Lee, Inho Kwak, Choong H. Kim, Bumjoo Lee, Byung Cheol Park, Junyoung Kwon, Wonshik Kyung, Changyoung Kim, Tae Won Noh, K. W. Kim

Type: Article

Publication Date: 2019-12-24

Citations: 4

DOI: https://doi.org/10.1103/physrevb.100.235139

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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.

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