Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.86: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Electronic structure of Fe3O4/MgO — •C. F. Chang1, J. Schlappa1, C. Schüßler-Langeheine1, H. Ott1, Z. Hu1, E. Schierle2, E. Weschke2, G. Kaindl2, A. Tanaka3, and L. H. Tjeng1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 3Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Magnetite thin films grown on flat and stepped MgO have been studied using transport and resonant soft x-ray diffraction measurements. Down to a thickness of 38 nm a clear 1st order Verwey transition is observed. Resonant soft x-ray diffraction at the Fe L2,3 and O-K resonances was used to study the electronic structure in the low-temperature phase. The broadening of the diffraction peaks along the surface normal in thin films allowed us not only to study the (001/2) superstructure peak at both resonances, but also the tail of the (001) diffraction peak, which cannot be reached at the Fe-L2,3 resonance for bulk samples. The electronic origin of both peaks turns out to be clearly different. Possible models for the ordered phase will be discussed.