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Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Magnetization Dynamics II

MA 14.6: Vortrag

Montag, 14. März 2011, 18:15–18:30, HSZ 403

Structual and electronic dynamics across the Verwey transition in magnetite — •C. Trabant1,2, N. Pontius2, C.-F. Chang1, T. Kachel2, M. Beye2,3, F. Sorgenfrei4, W. Schlotter3, S. de Jong3, R. Kukreja3, B. Bräuer3, M. Döhler1, S. Hossain3, C. Back3, A. Scherz3, D. Zhu3, J. Turner3, W.-S. Lee3, Y.-D. Chuang3, O. Krupin3, M. Buchholz1, P. Vogt1, W. Wurth4, A. Föhlisch2, C. Schüßler-Langeheine2,1, and H. A. Dürr31II. Physikalisches Institut, Universität zu Köln — 2Helmholtz-Zentrum Berlin — 3SLAC RSXS collaboration, USA — 4Universität Hamburg and CFEL

At 123K magnetite (Fe3O4) undergoes a metal-to-insulator transition, the Verwey transition. It is accompanied by a transition from a charge/orbital ordered low temperature state with monoclinic symmetry to a cubic phase without electronic order. Until today the question how structual and electronic degrees contribute to this transition has remained unanswered.

Here we report on a time-resolved soft x-ray diffraction experiment performed at the LCLS. By tuning the photon energy to the oxygen 1s → 2p and Fe 2p→ 3d excitation and off resonance we studied the structural and electronic response when the insulator-to-metal transition is induced by a fs laser pulse. We observered fast and slow timescales for all energies from which we derive a picture of the IR laser pulse induced phase transition. Supported by the DFG through SFB 608 and by the BMBF project 05K10PK2.

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