標題: Dynamics of phonons in Sr3Ir4Sn13: an experimental study by ultrafast spectroscopy measurements
作者: Luo, C. W.
Cheng, P. C.
Tu, C. M.
Kuo, C. N.
Wang, C. M.
Lue, C. S.
電子物理學系
Department of Electrophysics
關鍵字: Sr3Ir4Sn13;phonon;time resolved optical spectroscopy
公開日期: 26-Jul-2016
摘要: We report a study of ultrafast dynamics of photoexcited electrons and phonons in Sr3Ir4Sn13 using dual-color transient reflectivity change (Delta R/R) measurements. Time resolved optical spectroscopy of collective excitations reveal the marked features near its structural phase transition temperature T* similar or equal to 147 K. Two distinctive oscillatory timescales in Delta R/R 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.
URI: http://dx.doi.org/10.1088/1367-2630/18/7/073045
http://hdl.handle.net/11536/134130
ISSN: 1367-2630
DOI: 10.1088/1367-2630/18/7/073045
期刊: NEW JOURNAL OF PHYSICS
Volume: 18
起始頁: 0
結束頁: 0
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