Abstract
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 language | English |
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Article number | 073045 |
Journal | New Journal of Physics |
Volume | 18 |
Issue number | 7 |
DOIs | |
State | Published - 1 Jul 2016 |
Keywords
- Phonon
- Sr3Ir4Sn13
- Time resolved optical spectroscopy
- SUPERCONDUCTIVITY
- ORDER