Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 7: Microstructures and Phase Transformations: Oxides & Perovskites
MM 7.5: Talk
Monday, September 5, 2022, 16:45–17:00, H45
Band structure effects of a current-induced Mott-insulator to metal transition in Ca2RuO4 — •D. Curcio1, C. E. Sanders2, A. Chikina1, M. Bianchi1, H. E. Lund1, V. Granata3, M. Cannavacciuolo3, P. Dudin4, J. Avila4, C. Polley5, B. Thiagarajan5, A. Vecchione6, and P. Hofmann1 — 1Department of Physics and Astronomy, Aarhus University, Denmark — 2STFC Central Laser Facility, Harwell Campus, United Kingdom — 3Dipartimento di Fisica *E.R. Caianiello*, Università degli Studi di Salerno, Italy — 4Synchrotron SOLEIL, Gif-sur-Yvette, France — 5MAX IV Laboratory, Lund University, Lund, Sweden — 6CNR-SPIN, c/o Università degli Studi di Salerno, Italy
The Mott insulator Ca2RuO4 can be turned into a metal by the application of a weak electric field and a corresponding transport current. This transition affects the optical and magnetic properties of the material. However, because of the electric field’s presence and the field-induced energy broadening, it is challenging to determine the electronic structure in the metallic state by angle-resolved photoemission spectroscopy (ARPES). Making use of the recently introduced approach to enable ARPES measurements of current-carrying devices by using a nano-scale light spot [1], we are able to measure ARPES data that tracks the current-induced phase transition in Ca2RuO4 simultaneously with the electrical transport, revealing the spectral function of the current-induced state along with a potential map of the sample’s surface.
[1] D. Curcio et al. Phys. Rev. Lett. 125, 236403 (2020).