SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 37: Ruthenates
TT 37.10: Talk
Wednesday, March 29, 2023, 17:30–17:45, HSZ 201
Transport and structural characterisation of the metal to insulator transition in Ca2RuO4 nanoflakes — •Roman Hartmann1, Anita Guarino2, Rosalba Fittipaldi2, Mario Cuoco2, Elke Scheer1, Antonio Vecchione2, Gerardina Carbone3, and Angelo di Bernardo1 — 1Department of Physics, Universität Konstanz, Konstanz, Germany — 2CNR-Spin, Salerno, Italy — 3Max IV Laboratory, Lund, Sweden
The Mott-insulator Ca2RuO4 (CRO) has attracted considerable attention due to its insulator to metal transition (IMT) with a transition temperature of 357 K (insulating below, metallic above) and the ability to trigger the IMT using pressure, current or an electric field of just 40 V/cm [1,2]. Unfortunately, stress from a structural transition (orthorombic to tetragonal) during the IMT with an increase in unit cell volume [1] generally breaks bulk crystals. To overcome this limitation we have developed a method to fabricate CRO nanoflakes (despite it not being a layered material) that we can contact using standard lithographic methods. In these nanoflakes we can reversibly trigger the IMT thousands of times by passing current without breaking the sample. The robustness of the devices also enabled us to perform spatially resolved nano-diffraction measurements showing the current-dependent local formation of the metallic phase, confirming the reversibility and giving first insights in the timescale of the IMT.
[1] F. Nakamura et al. Sci. Rep. 3, 2536 (2013)
[2] R. Okazaki et al., JPSJ 82, 103702 (2013)