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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: Other Materials

TT 86.11: Talk

Thursday, April 3, 2014, 12:15–12:30, BEY 81

Investigation of the Verwey transition in Fe3O4 thin films — •Xionghua Liu, Diana Rata, Chun Fu Chang, Alexander Komarek, and Liu Hao Tjeng — Max Planck Institute for Chemical Physics of Solids, Dresden

Magnetite Fe3O4 is one of the most investigated materials from the class of correlated transition metal oxides. It shows a first-order anomaly in the temperature dependence of the electrical conductivity at TV = 125 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. Having found the optimum conditions for the growth of fully stoichiometric Fe3O4 thin films, we vary the substrate and study the influence of the microstructure on the Verwey transition. We are now able to obtain Fe3O4 thin films with TV higher than the bulk value.

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