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DF: Fachverband Dielektrische Festkörper
DF 8: Focus Session: Ferroic Domain Walls II
DF 8.6: Talk
Tuesday, March 8, 2016, 15:40–16:00, H25
Imaging of conducting domain walls in lithium niobate with energy filtered photoelectron microscopy — •Anna-Sophie Pawlik1, Andreas Koitzsch1, Thomas Kämpfe2, Andreas Haußmann2, Martin Knupfer1, Lukas Eng2, and Bernd Büchner1 — 1Leibniz Institute for Solid State and Materials Research Dresden, D-01069 Dresden, Germany — 2Institute for Applied Photo Physics, Technical University Dresden, D-01069 Dresden, Germany
Conductive domain walls (CDWs) in ferroelectrics are an intensively investigated novel topic in solid state research. However, up to now the chemical structure of CDWs and the microscopic origin of conductance is still hidden. The conducting behaviour of the material is investigated by means of energy filtered photoelectron microscopy (PEEM).
We confirmed that head-to-head domain walls are more conducting than the hosting bulk insulator by means of secondary electron emission upon x-ray illumination. Yet tail-to-tail domain walls are insulating, in accordance to theory. The conductive property depends considerably on the DW inclination angle relative to the polar axis: the more the angle deviates from 90∘, the lower the conductance.
Additionally we investigated 180∘ domain walls with energy filtered PEEM. We could resolve a contrast for different domains due to a work function difference of c+ and c− surfaces. The domain walls itself were not visible in PEEM measurements. With this we confirmed the insulating properties of the 180∘ domain walls