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

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arxiv 1908.04479 v1 pith:U262LGBS submitted 2019-08-13 cond-mat.str-el

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
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Tae Won Noh Kyungwan Kim
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keywords dynamicssr2rho4octahedralphononphotoinducedreflectivitystructuralacross
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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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