Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: Other Materials

TT 86.11: Vortrag

Donnerstag, 3. April 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 T_V = 125 K, the famous Verwey transition. However, thin films of Fe₃O₄ show always a lower T_V compared to the bulk material. In order to find out the reason for the decreased T_V 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 T_V higher than the bulk value.