Acoustic Phonon Dynamics in Co-Doped BaFe2As2 Thin Film
Alexander Bartenev, Roman Kolodka, Larry Theran, Ki-Tae Eom, Jong-Hoon Kang, Jason Kawasaki, Chang-Beom Eom, Sergiy Lysenko
Abstract
Pump-probe reflectivity reveals coherent acoustic oscillations at 33 and 8.2 GHz in a Ba(Fe0.92Co0.08)2As2 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.
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