Quasiparticle dynamics in FeSe superconductors studied by femtosecond spectroscopy

Chih-Wei Luo*, I. H. Wu, P. C. Cheng, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, Jenh-Yih Juang, T. Kobayashi, D. A. Chareev, O. S. Volkova, A. N. Vasiliev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The ultrafast quasiparticle dynamics in FeSe single crystals were measured by using dual-color transient reflectivity measurements (ΔR/R) from 4.4 to 290 K. In general, the typical ΔR/R of FeSe includes two significant components. One is the relaxation of photoinduced quasiparticles, which has been used to estimate the electron-phonon coupling strength (λ=0.16). The other is the oscillation component due to the acoustic phonon. Moreover, the acoustic phonon's energy estimated from the period of oscillation in ΔR/R markedly shrinks around 90 K, which is the so-called phonon softening.

Original languageEnglish
Pages (from-to)1213-1215
Number of pages3
JournalJournal of Superconductivity and Novel Magnetism
Issue number4
StatePublished - 1 Apr 2013


  • Electron-phonon coupling strength
  • Fe-based superconductors
  • Ultrafast quasiparticle dynamics


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