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MM: Fachverband Metall- und Materialphysik

MM 6: Phase Transformations

MM 6.10: Vortrag

Montag, 17. März 2025, 18:15–18:30, H10

Magnetic Imaging of the Local Insulator to Metal Transition in CaRuO by NV Magnetometry — •Hayden Binger¹, Cissy Suen², Elina Zhakina¹, Luke Turnbull¹, Yejin Lee¹, Young-Gwan Choi¹, Max Krautloher², Bernard Keimer², Claire Donnelly¹, and Uri Vool¹ — ¹Max Planck Institute for the Chemical Physics of Solids,Dresden, Germany — ²Max Planck Institute for Solid State Research, Stuttgart, Germany

The current-driven insulator to metal transition in Ca₂Ru₂O₄ is a fascinating phenomenon where increasing current driven across a sample causes a smaller voltage difference to develop. While this transition has been well studied in bulk Ca₂Ru₂O₄ through transport, and recently investigated by ARPES, little is known about the local character of the transition - especially in nanoscale devices. In this work we utilize scanning NV magnetometry to measure the local magnetic field induced by the local current in 100 nm thick lamellas of Ca₂Ru₂O₄. We observe a nonuniform field distribution that reveals the local current channels, allowing us to image the local character of the insulator to metal transition in Ca₂Ru₂O₄.

Keywords: NV Magnetometry; Calcium Ruthinate; Current Induced