Ultrafast Structural Dynamics along the β − γ Phase Transition Path in MnAs - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2019

Ultrafast Structural Dynamics along the β − γ Phase Transition Path in MnAs

Claire Laulhé
  • Function : Author
  • PersonId : 845362
Horia Popescu
  • Function : Author

Abstract

We investigate the orthorhombic distortion and the structural dynamics of epitaxial MnAs layers on GaAs(001) using static and time-resolved x-ray diffraction. Laser-induced intensity oscillations of Bragg reflections allow us to identify the optical phonon associated with orthorhombic distortion and to follow its softening along the path towards an undistorted phase of hexagonal symmetry. The frequency of this mode falls in the THz range, in agreement with recent calculations. Incomplete softening suggests that the $\beta-\gamma$ transformation deviates from a purely second-order displacive transition.
Fichier principal
Vignette du fichier
letter_MnAs_CRISTAL_preprint.pdf (758.91 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02096578 , version 1 (03-07-2019)

Identifiers

Cite

Franck Vidal, Yunlin Zheng, Lounès Lounis, Leticia Coelho, Claire Laulhé, et al.. Ultrafast Structural Dynamics along the β − γ Phase Transition Path in MnAs. Physical Review Letters, 2019, 122 (14), ⟨10.1103/PhysRevLett.122.145702⟩. ⟨hal-02096578⟩
164 View
67 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More