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arXiv 1908.04479cond-mat.str-el
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时间分辨反射光谱研究Sr2RhO4结构演化的证据

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

摘要:

利用飞秒近红外脉冲研究了Sr2RhO4的光致反射超快动力学。我们观察到一个明显的温度依赖的异常,在其电子动力学减慢低于160 K。此外,A1g对称的5.3太赫兹声子的相干振荡在其初始相位中表现出90度的位移,表明八面体旋转扭曲的结构变化。我们认为Sr_2RhO_4中的八面体结构在TS附近演化,它可以影响光生载流子的非平衡动力学以及实时声子响应。

英文摘要:

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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