Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.80: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Barium titanate: A promising candidate for the use of oxide-based electronics. — •Peter Lutz1,2, Sebastian Fiedler1,2, Chul-Hee Min1,2, Hendrik Bentmann1,2, and Friedrich Reinert1,2 — 1Experimentelle Physik VII, Universität Würzburg, 97074 Würzburg, Germany — 2Gemeinschaftslabor für Nanoanalytik, Karlsruher Institute für Technologie KIT, 76021 Karlsruhe, Germany
Barium titanate (BTO) belongs to the material class of transition metal oxides which recently arouse a great deal of attention because of their multifunctional character and the rich physics occurring especially at oxide interfaces [1,2]. BTO is a particularly interesting oxide material showing ferroelectric properties and several structural phase transitions as a function of temperature [3,4]. One idea is to use this material as a substrate for thin films and to modify the film properties through the electric polarization direction. This requires detailed knowledge of the surface electronic and structural properties. To this end we investigate the influence of different preparation processes on the surface properties of BTO using tunneling spectroscopy (STM/STS), electron spectroscopy (XPS/UPS) and electron diffraction (SPALEED). We focus in particular on the processes for the evolution of oxygen vacancies at the surface in regard of their influence on the electronic structure and of their function in the formation of thin layers on the substrate.
[1] H. Y. Hwang et al., Nature Mat., 11, 103 (2012) [2] C. H. Ahn et al., Nature, 424, 1015 (2003) [3] R. E. Cohen, Nature, 358, 136 (1992) [4] W. Zhong et al, PRL, 73, 1861 (1994)