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 |
Appears in Collections: | Articles |
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