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Ultrafast light-induced shear strain probed by time-resolved x-ray diffraction: Multiferroic BiFeO3 as a case study

Abstract : Enabling the light control of complex systems on ultrashort timescales gives rise to rich physics with promising applications. Although crucial, the quantitative determination of both the longitudinal and the shear photoinduced strains still remains challenging. Here, by scrutinizing asymmetric Bragg peaks pairs (±h01) in BiFeO3 using picosecond time-resolved x-ray diffraction experiments, we simultaneously determine the longitudinal and shear strains. Importantly, we reveal a difference in the dynamical response of the longitudinal strain with respect to the shear one due to an interplay of quasilongitudinal and quasitransverse acoustic modes, well reproduced by our model. Finally, we show that the relative amplitude of those strains can be explained only if both thermal and nonthermal processes contribute to the acoustic phonon photogeneration process.
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https://hal.archives-ouvertes.fr/hal-03080497
Contributor : Vincent Juvé Connect in order to contact the contributor
Submitted on : Thursday, December 17, 2020 - 5:24:00 PM
Last modification on : Tuesday, January 25, 2022 - 3:08:32 AM
Long-term archiving on: : Thursday, March 18, 2021 - 8:26:10 PM

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V Juvé, R Gu, S Gable, T Maroutian, G Vaudel, et al.. Ultrafast light-induced shear strain probed by time-resolved x-ray diffraction: Multiferroic BiFeO3 as a case study. Physical Review B, American Physical Society, 2020, ⟨10.1103/PhysRevB.102.220303⟩. ⟨hal-03080497⟩

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