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DS: Fachverband Dünne Schichten

DS 25: Focus Session: Resistive Switching by Redox and Phase Change Phenomena II (Valence and phase change in oxides)

DS 25.2: Talk

Wednesday, April 2, 2014, 11:45–12:00, CHE 89

First principles investigation of Sr-rich phases in SrTiO₃ — •Ivetta Slipukhina, Stefan Blügel, and Marjana Ležaić — Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Perovskite-type oxides exhibit a whole variety of functionlities, among which resistive switching is one of the most interesting due to the potential use in non-volatile random access memory. In many of these materials the unintentionally formed secondary phases are known to be responsible for the observed resistive switching phenomena. Recently, Sr-rich secondary phases were observed during electroforming in SrTiO₃ thin films grown by pulsed laser deposition [A. Köhl, PhD thesis]. The structure and composition of these phases are unknown so far. By means of ab initio calculations, we have considered possible mechanisms for the formation of Sr-rich phases in SrTiO₃ and compared the calculated electronic structures with the existing experimental XPS and XAS data.

This work was supported by the SFB917-Nanoswitches.