Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 25: Transport (Diffusion, conductivity, heat)
MM 25.11: Talk
Wednesday, April 3, 2019, 13:00–13:15, H46
Investigations of ionic transport in bicrystals of Sr-doped LaMnO3 — •Jacqueline Marie Börgers1,2 and Roger De Souza1 — 1Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany — 2Peter Grünberg Institut, Forschungszentrum Jülich GmbH, Jülich, Germany
Mixed-valence manganites are very promising candidates as materials for resistive switching due to the possibility to generate multilevel resistance states as well as area-dependent switching. This enables their use in future non-volatile memory or novel neuromorphic circuits.
It is widely accepted that ionic transport plays an important role in the field of resistive switching. Also for manganites the key mechanism is assumed to be drift and diffusion of oxygen vacancies. Additionally, by varying the composition and microstructure of manganites the electronic and ionic transport properties can be influenced. The aim of this study is to illuminate the relationship between structural factors of the material and its switching performance. Hereby, we are particularly interested in the influence of grain boundaries on the transport mechanisms.
Therefore, the ionic transport along grain-boundaries in Sr doped LaMnO3 ( (La1−xSrx)MnO3±δ ,LSMO) is studied in order to gain further insight on its switching mechanisms. The migration of oxygen ions in bicrystals of LSMO is studied by Molecular Dynamics (MD) simulations employing empirical pair potentials. In addition, static atomistic simulations are used to gain further insights into defect formation processes.