SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 14: Polar Oxide Crystals and Solid Solutions II
KFM 14.1: Vortrag
Donnerstag, 30. März 2023, 14:00–14:20, POT 106
Domain wall current in lithium niobate single crystals at temperatures up to 370°C — •U. Yakhnevych1, M. Kunzner1, I. Kiseleva2, J. Gössel2, J. Ratzenberger2, M. Rüsing2, L.M. Eng2,3, and H. Fritze1 — 1Institut für Energieforschung und Physikalische Technologien, TU Clausthal, Am Stollen 19 B, Goslar, 38640, Germany — 2Institut für Angewandte Physik, TU Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — 3Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden, 01062 Dresden, Germany
Lithium niobate (LN) ferroelectric crystals with an artificially formed domain structure are widely used in novel electronic devices. So far, a complete picture of the electrical transport mechanism at domain walls is still missing, including its high temperature behavior. This work focuses on the determination of the domain wall conductivity from room temperature up to 370 °C. Using 5%MgO:LN, conductive DWs are prepared and enhanced following the procedure by Godau et al. [1]. Direct current measurements using an electrometer amplifier and impedance spectroscopy are applied to locally map the temperature-dependent DW current. A strong dependence of the electrical conductivity on temperature is observed. The activation energy shows distinct values for low-to-medium and high temperatures, respectively, reaching values of ~0.1 eV and ~0.15*eV. For further analysis, the obtained samples should be measured at even higher temperatures. [1] C. Godau, T. Kämpfe, A. Thiessen at al. ACS Nano 11, 5, 4816-4824 (2017). https://doi.org/10.1021/acsnano.7b01199