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

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. Furthermore, the frequency of this mode falls in the THz range, in agreement with recent calculations. Incomplete softening suggests that the β–γ transformation deviates from a purely second-order displacive transition.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [9];  [9];  [9];  [10];  [10];  [10];  [10];  [1];  [11]
  1. Sorbonne Univ., Paris (France)
  2. Sorbonne Univ., Paris (France); PSL Research Univ., Paris (France)
  3. Sorbonne Univ., Paris (France); Univ. de Brasilia - DF (Brazil)
  4. Synchrotron SOLEIL, Gif-sur-Yvette Cedex (France); Univ. Paris-Saclay (Univ. Paris-Sud), Orsay Cedex (France)
  5. Univ. Paris-Saclay, Orsay Cedex (France); ELETTRA – Sincrotrone Trieste, Trieste (Italy)
  6. Synchrotron SOLEIL, Gif-sur-Yvette Cedex (France)
  7. ELETTRA – Sincrotrone Trieste, Trieste (Italy); Ecole Polytechnique Fédérale de Lausanne, Lausanne (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  8. ELETTRA – Sincrotrone Trieste, Trieste (Italy)
  9. Chinese Academy of Sciences (CAS), Beijing (China)
  10. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  11. Sorbonne Univ., Paris (France); Synchrotron SOLEIL, Gif-sur-Yvette Cedex (France)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1526468
Alternate Identifier(s):
OSTI ID: 1505886
Grant/Contract Number:  
AC02-76SF00515; IZK0Z2-175481; U1632264
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Vidal, Franck, Zheng, Yunlin, Lounis, Lounès, Coelho, Leticia, Laulhé, Claire, Spezzani, Carlo, Ciavardini, Alessandra, Popescu, Horia, Ferrari, Eugenio, Allaria, Enrico, Ma, Jialin, Wang, Hailong, Zhao, Jianhua, Chollet, Matthieu, Seaberg, Matthew, Alonso-Mori, Roberto, Glownia, James M., Eddrief, Mahmoud, and Sacchi, Maurizio. Ultrafast Structural Dynamics along the β–γ Phase Transition Path in MnAs. United States: N. p., 2019. Web. doi:10.1103/physrevlett.122.145702.
Vidal, Franck, Zheng, Yunlin, Lounis, Lounès, Coelho, Leticia, Laulhé, Claire, Spezzani, Carlo, Ciavardini, Alessandra, Popescu, Horia, Ferrari, Eugenio, Allaria, Enrico, Ma, Jialin, Wang, Hailong, Zhao, Jianhua, Chollet, Matthieu, Seaberg, Matthew, Alonso-Mori, Roberto, Glownia, James M., Eddrief, Mahmoud, & Sacchi, Maurizio. Ultrafast Structural Dynamics along the β–γ Phase Transition Path in MnAs. United States. doi:10.1103/physrevlett.122.145702.
Vidal, Franck, Zheng, Yunlin, Lounis, Lounès, Coelho, Leticia, Laulhé, Claire, Spezzani, Carlo, Ciavardini, Alessandra, Popescu, Horia, Ferrari, Eugenio, Allaria, Enrico, Ma, Jialin, Wang, Hailong, Zhao, Jianhua, Chollet, Matthieu, Seaberg, Matthew, Alonso-Mori, Roberto, Glownia, James M., Eddrief, Mahmoud, and Sacchi, Maurizio. Tue . "Ultrafast Structural Dynamics along the β–γ Phase Transition Path in MnAs". United States. doi:10.1103/physrevlett.122.145702.
@article{osti_1526468,
title = {Ultrafast Structural Dynamics along the β–γ Phase Transition Path in MnAs},
author = {Vidal, Franck and Zheng, Yunlin and Lounis, Lounès and Coelho, Leticia and Laulhé, Claire and Spezzani, Carlo and Ciavardini, Alessandra and Popescu, Horia and Ferrari, Eugenio and Allaria, Enrico and Ma, Jialin and Wang, Hailong and Zhao, Jianhua and Chollet, Matthieu and Seaberg, Matthew and Alonso-Mori, Roberto and Glownia, James M. and Eddrief, Mahmoud and Sacchi, Maurizio},
abstractNote = {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. Furthermore, the frequency of this mode falls in the THz range, in agreement with recent calculations. Incomplete softening suggests that the β–γ transformation deviates from a purely second-order displacive transition.},
doi = {10.1103/physrevlett.122.145702},
journal = {Physical Review Letters},
number = 14,
volume = 122,
place = {United States},
year = {2019},
month = {4}
}

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