Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 28: Focus Session: Quantum Sensing with Solid State Spin defects II (joint session TT/HL/MA)
MA 28.1: Vortrag
Mittwoch, 11. März 2026, 09:30–09:45, HSZ/0101
Locally Imaging the Insulator to Metal Transition of Ca2RuO4 with Single Spin Magnetometry — •Hayden Binger1, Cissy Suen2, Young-Gwan Choi1, Yejin Lee1, Haolin Jin1, Max Krautloher2, Yuchen Zhao1, Luke Turnbull1, Elina Zhakina1, Jeffrey Neethirajan1, Lotte Boer1, Berit Goodge1, Piotr Surówka3, Roderich Moessner4, Bernhard Keimer2, Claire Donnelly1, and Uri Vool1 — 1MPI CPfS, Dresden, Germany — 2MPI FKF, Stuttgart, Germany — 3Wrocław University of Science and Technology, Wrocław, Poland — 4MPI PKS, Dresden, Germany
The current-driven insulator to metal transition (IMT) in Ca2RuO4 is a fascinating phenomenon where increasing current driven across a sample causes a smaller voltage difference to develop. We have created devices of size 10-20 um by 10-20 um and 100 nm thick using Focused Ion Beam (FIB) milling. Through the utilization of Nitrogen Vacancies (NV), optically addressable spin-1 defects acting as a qubit at room temperature, we probe the local magnetic field at the defect via the Zeeman interaction. We are thusly able to image the local character of the insulator to metal transition in Ca2RuO4. At low currents we image the formation of a singular conducting channel at the edge of the device, which gradually grows throughout the entire device as more current is applied until eventually current flows evenly across the device. We explore reasons why local current channels nucleate at the edge, such as strain, defects, and crystalline lattice orientation.
Keywords: Nitrogen Vacancy Magnetometry; Insulator to Metal Transition; Current Imaging