Dynamics of phonons in Sr3Ir4Sn13: an experimental study by ultrafast spectroscopy measurements

C. W. Luo, P. C. Cheng, C. M. Tu, C. N. Kuo, C. M. Wang, C. S. Lue

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

We report a study of ultrafast dynamics of photoexcited electrons and phonons in Sr3Ir4Sn13 using dual-color transient reflectivity change (ΔR/R) measurements. Time resolved optical spectroscopy of collective excitations reveal the marked features near its structural phase transition temperature K. Two distinctive oscillatory timescales in have been clearly resolved. The rapid THz-range oscillations are attributed to the dynamics of the optical phonons which strongly correlate to the structural phase transition. The slow GHz-range oscillatory phenomenon which only occurs below about 150 K is associated with the dynamic response of the longitudinal-acoustic phonons. These low-energy phonons show a softening feature on approaching the transition temperature, also indicating a strong relevance to the structural phase transition. The information that we demonstrated would provide a deeper understanding of the structural phase transition in Sr3Ir4Sn13.

原文English
文章編號073045
期刊New Journal of Physics
18
發行號7
DOIs
出版狀態Published - 1 七月 2016

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