Berlin 2008 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.11: Talk

Tuesday, February 26, 2008, 13:00–13:15, A 151

Resistive memory switching in perovskite-derivative single crystals — •P. Müller¹, F. Chowdhury¹, V. Dremov¹, Y. Koval¹, F. Lichtenberg², S. Müller³, D. Schmeißer³, and R. Pentcheva⁴ — ¹Institut für Physik der Kondensierten Materie, Universität Erlangen-Nürnberg — ²Experimentalphysik VI, Universität Augsburg — ³Lehrstuhl Angewandte Physik-Sensorik, BTU Cottbus — ⁴Department of Earth and Environmental Sciences, LMU München

We investigated several layered perovskite derivatives of the family A_nB_nO_3n+2, such as LaTiO_3.41, CaNbO_3.41 and SrNbO_3.41, which can be considered as a stacking of blocks consisting of 5 perovskite layers. Electric transport across these layers takes place via intrinsic tunnelling. Mesa devices with a cross-sectional area of 50 to 200 µm² and a height between 30 and 500 nm were fabricated by electron-beam lithography and ion-beam etching. Both dc I-V characteristics and pulsed current injection have shown switching between different resistive states in these materials. The resistive states have long-term stability, which makes them interesting for memory applications. The transport experiments suggest that switching and resistive memory are controlled by trapping and release of charge carriers. Furthermore, photoelectron and NEXAFS spectroscopy of cleaved LaTiO_3.41 surfaces have been performed. The results are compared to recent correlated band theory (LDA+U) calculations.