Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Transport: Spintronics, Magnetotransport 2 (jointly with HL and MA)
TT 68.3: Vortrag
Freitag, 15. März 2013, 10:00–10:15, H20
Investigation of the Verwey transition in Fe3O4 thin films — •Xionghua Liu, Akfiny Hasdi Aimon, A. Diana Rata, Chun-Fu Chang, and Liu Hao Tjeng — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
Magnetite Fe3O4 is one of the most investigated materials from the class of transition metal oxides. It shows a first-order anomaly in the temperature dependence of the electrical conductivity at TV= 120 K, the famous Verwey transition. However, thin films of Fe3O4 show always a lower TV compared to the bulk material. In order to find out the reason for the decreased TV in magnetite thin films we have performed a systematic investigation of the transport properties in dependence of the oxygen pressure and thickness. Epitaxial Fe3O4 films were grown by Molecular Beam Epitaxy on MgO(100) and MgAl2O4 (100) substrates and the structural and spectroscopic characteristics were in-situ determined by RHEED and XPS, respectively. Resistivity measurements have been performed ex-situ by PPMS. Results of this study and ongoing work will be presented.