Coherent structural dynamics in V2O3 under hydrostatic pressure

Janod Etienne (1) , Corraze Benoit (1) , Tranchant Julien (1) , Danylo Babich (2) , Cario Laurent (1) , Thomas Gauthier (3) , Nicolas Godin (3) , Gaël Privault (3) , Roman Bertoni (3)

1 IMN - Institut des Matériaux de Nantes Jean Rouxel
2 PSI - Paul Scherrer Institute
3 IPR - Institut de Physique de Rennes

Recently, material science has moved from observing and understanding electronic and structural orders to control physical properties of materials on command by using external stimuli such as light. From this point of view, a crucial aspect is the understanding of the fundamental interactions within the system (electron-electron and electron-phonon) to control the emergent cooperative effects. Here, we combine ultrafast optical spectroscopy and high-pressure setup to monitor the out-of-equilibirum dynamics of the material under well-defined controlled thermodynamical environnement. The obtained results demonstrate the use of spectroscopy of coherent phonon as a thermodynamical phase marker of the Insulator to Metal Transition in V2O3 thin film. More intriguing, the variation of frequency of the observed phonon optical mode ( A1g ) seems to reflect the manifestation of critical coupling between lattice and electronic degrees of freedom near transition line with a drop of frequency near the critical pressure.

Mots clés: Ultra - fast Spectroscopy

Domaines: Electrons fortement corrélés [cond-mat.str-el]; Physique [physics]

Janod Etienne, Corraze Benoit, Tranchant Julien, Danylo Babich, Cario Laurent, et al.. Coherent structural dynamics in V2O3 under hydrostatic pressure. GdRUP, Dec 2023, Paris, France. ⟨hal-04414513⟩