Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.27: Poster

Dienstag, 21. März 2017, 14:00–16:00, P1C

Interplay of oxygen vacancies and conductance in SrMnO₃ thin films under epitaxial tensile strain — •Lokamani Lokamani¹, Carina Faber³, Peter Zahn², Nicola Spaldin³, and Sibylle Gemming^1,2 — ¹Institute of Ion Beam Physics and Materials Research, HZDR, 01314 Dresden, Germany — ²Institute of Physics, Technische Universität, 09107 Chemnitz, Germany — ³Materials Theory, ETH, 8093 Zürich, Switzerland

Strontium manganate (SrMnO₃), a perovskite polymorph, exhibits cubic structure at low temperatures, which transforms under tensile strain into a G-type-antiferromagnetic (G-AFM) antiferrodistortive polar phase in the plane parallel to the substrate[1]. Recently, ferroelectric domains have been observed experimentally in 20nm thin films of SrMnO₃ under 1.7% tensile strain on (001)-oriented LSAT grown in an oxygen-deficient atmosphere[2]. Strikingly, the individual domains show different conductance features, whereas the domain walls were found to be electrically insulating, rendering the domains to form stable nano-capacitors with high charge rention times.

Here, we present a detailed first-principle investigation of the domain wall formation in strained SrMnO₃, their electronic properties and the influence of oxygen vacancies on the 2D-electron gas at the polar domain walls. Preliminary results on the migration energetics of the oxygen vacancies are expected.