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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.65: Poster

Tuesday, March 12, 2013, 10:30–13:30, Poster D

Electronic and magnetic properties of Ti4O7 and Ti5O9 Magnéli phasesIvetta V. Slipukhina, •Konstantin Z. Rushchanskii, Stefan Blügel, and Marjana Ležaić — Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

For several decades binary transition-metal oxides have attracted increasing attention as resistively switching materials. Resistive switching in many of these oxides is claimed to be based on the formation and disruption of highly-conductive filaments, through which the current flow is realized. However, still very little is known about the composition, structure and dimensions of these filaments. Recent low-temperature conductivity and in situ current-voltage measurements confirmed that the conducting filaments in Pt/TiO2/Pt [1], as well as Fe-doped SrTiO3 [2] are composed of Magnéli phases TinO2n−1 (mostly n=4 or 5), which are mixed-valence compounds with two Ti3+ (3d1 electronic configuration) and (n−2) Ti4+ (3d0 configuration) ions.

In this work we aimed to develop a fundamental understanding of the mechanisms that underlie the phase transitions in Magnéli phases like Ti5O9 and Ti4O7. With this aim we performed DFT calculations in order to illuminate the changes in their electronic structure on a microscopic level and establish relations between the structural, electronic and magnetic properties and their role in phase transitions.

We acknowledge the support by SFB917-Nanoswitches and the Helmholtz Young Investigators Group Programme VH-NG-409.

[1] D.-H. Kwon et al., Nature Nanotech. 5, 148 (2010).
R. Münstermann et al., Advanced Materials 22, 4819 (2010).

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