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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. Trabant^1,2, N. Pontius², C.-F. Chang¹, T. Kachel², M. Beye^2,3, 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-Langeheine^2,1, and H. A. Dürr³ — ¹II. 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.