Acoustic Phonon Dynamics in Co-Doped BaFe$_2$As$_2$ Thin Film

Alexander Bartenev; Roman Kolodka; Larry Theran; Ki-Tae Eom; Jong-Hoon Kang; Jason Kawasaki; Chang-Beom Eom; Sergiy Lysenko

Acoustic Phonon Dynamics in Co-Doped BaFe$_2$As$_2$ Thin Film

Superconductivity 2026-07-20 v1

Authors: Alexander Bartenev , Roman Kolodka , Larry Theran , Ki-Tae Eom , Jong-Hoon Kang , Jason Kawasaki , Chang-Beom Eom , Sergiy Lysenko

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Abstract

Pump-probe reflectivity reveals coherent acoustic oscillations at 33 and 8.2 GHz in a Ba(Fe $_{0.92}$ Co $_{0.08}$ ) $_2$ As $_2$ thin film. The acoustic response was analyzed using a modified logistic-function model, suggesting a temporal redistribution of coherent acoustic energy consistent with anharmonic decay of the higher-frequency mode into the lower-frequency mode.

Keywords

pump-probe reflectivity coherent acoustic phonons BaFe2As2 thin film anharmonic decay logistic-function model

Cite

@article{arxiv.2607.18583,
  title  = {Acoustic Phonon Dynamics in Co-Doped BaFe$_2$As$_2$ Thin Film},
  author = {Alexander Bartenev and Roman Kolodka and Larry Theran and Ki-Tae Eom and Jong-Hoon Kang and Jason Kawasaki and Chang-Beom Eom and Sergiy Lysenko},
  journal= {arXiv preprint arXiv:2607.18583},
  year   = {2026}
}

Comments

3 pages, 1 figure, 1 table. Accepted for presentation at Frontiers in Optics + Laser Science (FiO LS 2026)