Study of Elastic and Structural Properties of BaFeAs Ultrathin Film Using Picosecond Ultrasonics

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2023 Nov 14

PMID 37959629

Authors

Di Cheng

Boqun Song

Jong-Hoon Kang

Chris Sundahl

Anthony L Edgeton

Liang Luo

Joong-Mok Park

Yesusa G Collantes

Eric E Hellstrom

Martin Mootz

Ilias E Perakis

Chang-Beom Eom

Jigang Wang

Affiliations

Soon will be listed here.

Abstract

We obtain the through-thickness elastic stiffness coefficient () in nominal 9 nm and 60 nm BaFeAs (Ba-122) thin films by using picosecond ultrasonics. Particularly, we reveal the increase in elastic stiffness as film thickness decreases from bulk value down to 9 nm, which we attribute to the increase in intrinsic strain near the film-substrate interface. Our density functional theory (DFT) calculations reproduce the observed acoustic oscillation frequencies well. In addition, temperature dependence of longitudinal acoustic (LA) phonon mode frequency for 9 nm Ba-122 thin film is reported. The frequency change is attributed to the change in Ba-122 orthorhombicity (a-b)/(a+b). This conclusion can be corroborated by our previous ultrafast ellipticity measurements in 9 nm Ba-122 thin film, which exhibit strong temperature dependence and indicate the structural phase transition temperature .

Citing Articles

Probing Non-Equilibrium Pair-Breaking and Quasiparticle Dynamics in Nb Superconducting Resonators Under Magnetic Fields.

Park J, Chong Z, Kim R, Haeuser S, Chan R, Murthy A Materials (Basel). 2025; 18(3).

PMID: 39942235 PMC: 11818216. DOI: 10.3390/ma18030569.

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