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Article Dans Une Revue Nature Communications Année : 2024

Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction

Marius Hervé
Gaël Privault
Elzbieta Trzop
Serhane Zerdane
Ievgeniia F Chaban
Céline Mariette
Alix Volte
  • Fonction : Auteur
  • PersonId : 177244
  • IdHAL : alix-volte

Résumé

Ultrafast photoinduced phase transitions at room temperature, driven by a single laser shot and persisting long after stimuli, represent emerging routes for ultrafast control over materials’ properties. Time-resolved studies provide fundamental mechanistic insight into far-from-equilibrium electronic and structural dynamics. Here we study the photoinduced phase transformation of the Rb0.94Mn0.94Co0.06[Fe(CN)6]0.98 material, designed to exhibit a 75 K wide thermal hysteresis around room temperature between MnIIIFeII tetragonal and MnIIFeIII cubic phases. We developed a specific powder sample streaming technique to monitor by ultrafast X-ray diffraction the structural and symmetry changes. We show that the photoinduced polarons expand the lattice, while the tetragonal-to-cubic photoinduced phase transition occurs within 100 ps above threshold fluence. These results are rationalized within the framework of the Landau theory of phase transition as an elastically-driven and cooperative process. We foresee broad applications of the streaming powder technique to study non-reversible and ultrafast dynamics.
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hal-04431335 , version 1 (01-02-2024)

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Marius Hervé, Gaël Privault, Elzbieta Trzop, Shintaro Akagi, Yves Watier, et al.. Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction. Nature Communications, 2024, Nature Communications, 15 (1), ⟨10.1038/s41467-023-44440-3⟩. ⟨hal-04431335⟩
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