Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Ferroics – Domains and Domain Walls 1

KFM 14.5: Vortrag

Mittwoch, 7. September 2022, 11:05–11:25, H5

Stability of enhanced domain wall conductivity in single-crystalline lithium niobate — •Ahmed Samir Lotfy1,2, Manuel Zahn1, Michael Rüsing1, and Lukas Eng11Institute of Applied Physics, Technische Universität Dresden, Dresden, Germany — 2Department of materials, ETH Zürich, Zürich, Switzerland

Domain-wall conductivity (DWC) in ferroelectrics has emerged as a key functionality for developing nanoelectronic devices. In this regard, lithium niobate (LNO) is a promising candidate as previous studies have shown the capability to significantly enhance its DWC by making use of head-to-head and tail-to-tail DW configurations, and DW inclination angles under voltage treatments. However, understanding of the temporal and temperature-dependent stability of the enhanced DWC is lacking, limiting further steps of device implementation. For this, we performed a series of conductive atomic force microscopy and macroscopic electrometer measurements on single crystalline LNO samples. We show a characteristic conductance trend during voltage-induced enhancement which provides insights into the temporal stability of DWC. Moreover, our temperature-dependent measurements between 100 K and 300 K reveal the transport mechanism along the walls, pointing to the role of bound polarons. This is confirmed by the calculation of the activation energy. These results provide key insights into the stability of DWC in LNO for applications in practical devices.

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