Speaker
Benoit Truc
(EPFL)
Description
Magnetite (Fe3O4) is the first magnetic material ever discovered. At 125K, the system undergoes a metal-insulator transition (MIT) accompanied by a structural transition as well as a magnetic rearrangement, the so-called Verwey transition.
Light offers the appealing possibility of manipulating the electronic and structural properties of matter. Here, using two different photon-energies, we directly visualize the photo-induced structural dynamics of Magnetite using the ultrafast electron diffraction (UED) technique providing sub pm/ps spatio-temporal resolution. We found two distinct behaviors that could be explained by different interactions between the electronic/magnetic degrees of freedom and the crystal structure.
Authors
Benoit Truc
(EPFL)
Paolo Usai
(Ecole Polytechnique Federale de Lausanne)
Dr
Siham Benhabib
(EPFL)
Dr
Francesco Pennacchio
(Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland )
Prof.
Vanacore Giovanni Maria
(Laboratory of Ultrafast Microscopy for Nanoscale Dynamics (LUMiNaD), Department of Materials Science, University of Milano-Bicocca, Via Cozzi 55, 20125 Milan, Italy )
Fabrizio Carbone
(EPFL)
