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

We report a study of ultrafast dynamics of photoexcited electrons and phonons in Sr3Ir4Sn13 using dual-color transient reflectivity change ( Δ R / R ) measurements. Time resolved optical spectroscopy of collective excitations reveal the marked features near its structural phase transition temperatur...

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Bibliographic Details
Published in:New journal of physics 2016-07, Vol.18 (7), p.073045
Main Authors: Luo, C W, Cheng, P C, Tu, C M, Kuo, C N, Wang, C M, Lue, C S
Format: Article
Language:English
Subjects:
64.70.kd
78.47.D
78.47.J
Dynamic response
Dynamic structural analysis
Excitation spectra
Phase transitions
phonon
Phonons
Physics
Spectroscopic analysis
Spectrum analysis
Sr3Ir4Sn13
Temperature
time resolved optical spectroscopy
Transition temperature
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Summary:We report a study of ultrafast dynamics of photoexcited electrons and phonons in Sr3Ir4Sn13 using dual-color transient reflectivity change ( Δ R / R ) measurements. Time resolved optical spectroscopy of collective excitations reveal the marked features near its structural phase transition temperature T * 147 K. Two distinctive oscillatory timescales in Δ 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.
ISSN:1367-2630
DOI:10.1088/1367-2630/18/7/073045