Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 25: Transport Properties

DS 25.1: Talk

Thursday, September 8, 2022, 15:00–15:15, H14

Visualization of metallic filament formation in rare-earth nickelates via optical microscopy — •Theodor Luibrand¹, Stefan Guénon¹, Farnaz Tahouni-Bonab¹, Javier del Valle², Claribel Domínguez², Willem Rischau², Lucia Varbaro², Stefano Gariglio², Rodolfo Rocco³, Soumen Bag³, Marcelo Rozenberg³, Jean-Marc Triscone², Reinhold Kleiner¹, and Dieter Koelle¹ — ¹Physikalisches Institut, Center for Quantum Science (CQ) an LISA⁺, Universität Tübingen, 72076 Tübingen, Germany — ²Department of Quantum Matter Physics, Université de Genève, 1211 Geneva, Switzerland — ³Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France

In recent years, there has been growing interest in resistive switching in strongly correlated materials. Resistive switching is at the core of memristive devices, which are considered as crucial elements in the emerging field of neuromorphic computing. However, in many systems, the details of the resistive switching mechanisms are elusive. We investigated the resistive switching of two types of rare-earth nickelate (NdNiO₃ and SmNiO₃) thin film devices. Both materials undergo insulator-to-metal transitions (IMT) from low-temperature antiferromagnetic or paramagnetic insulating to high-temperature paramagnetic metallic phases. Current-voltage characteristics acquired at device temperatures near the IMT show jumps towards lower voltages indicating resistive switching. We find that these events are accompanied by the formation of spatially confined conducting filaments, which is revealed by a change in reflectivity in optical images.