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Ultrafast Structural Dynamics along the ß-γ Phase Transition Path in MnAs.
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.
Afiliación
  • Vidal F; Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France.
  • Zheng Y; Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France.
  • Lounis L; Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France.
  • Coelho L; PSL Research University, 75231 Paris, France.
  • Laulhé C; Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France.
  • Spezzani C; Instituto de Física, Universidade de Brasília UnB, Brasília-DF, CEP 70910-900, Brazil.
  • Ciavardini A; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France.
  • Popescu H; Université Paris-Saclay (Université Paris-Sud), F-91405 Orsay Cedex, France.
  • Ferrari E; Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France.
  • Allaria E; ELETTRA - Sincrotrone Trieste, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
  • Ma J; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France.
  • Wang H; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France.
  • Zhao J; ELETTRA - Sincrotrone Trieste, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
  • Chollet M; Particle Accelerator Physics Laboratory, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
  • Seaberg M; ELETTRA - Sincrotrone Trieste, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
  • Alonso-Mori R; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China.
  • Glownia JM; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China.
  • Eddrief M; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China.
  • Sacchi M; Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
Phys Rev Lett ; 122(14): 145702, 2019 Apr 12.
Article en En | MEDLINE | ID: mdl-31050465
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 ß-γ transformation deviates from a purely second-order displacive transition.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos