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

Chih-Wei Luo, P. C. Cheng, Chien-Ming Tu, C. N. Kuo, C. M. Wang, C. S. Lue

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6 Scopus citations


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.

Original languageEnglish
Article number073045
JournalNew Journal of Physics
Issue number7
StatePublished - 1 Jul 2016


  • Phonon
  • Sr3Ir4Sn13
  • Time resolved optical spectroscopy

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