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TT: Fachverband Tiefe Temperaturen
TT 81: Correlated Electrons: Other Materials
TT 81.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, HSZ/0101
Transport properties of the metal to insulator transition in Ca2RuO4 nanoflakes — •Roman Hartmann1, Rosalba Fittipaldi3, Antonio Vecchione3, Elke Scheer1, and Angelo Di Bernardo1,2 — 1FB Physik, Universität Konstanz, Konstanz, Germany — 2Dipartimento di Fisica, Università di Salerno, Fisciano, Italy — 3CNR-Spin, Salerno, Italy
The Mott insulator calcium ruthenate 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 combined with an increase in unit cell volume [1] generally breaks bulk crystals.
To overcome this limitation we have developed a method to fabricate sub-micron CRO flakes from bulk single crystals (despite it not being a layered material) that we can contact using standard lithographic and thin film techniques.
In these flakes we can reversibly trigger the IMT thousands of times by passing current without breaking the sample. The robustness of the devices enables us to switch at high frequencies paving the way for potential applications and enabling us to to gain further insight into the nature of the IMT [3].
[1] F. Nakamura et al., Sci. Rep. 3, 2536 (2013)
[2] R. Okazaki et al., JPSJ 82, 103702 (2013)
[3] V. K. Bhartiya et. al., arXiv:2504.17871 (2025)
Keywords: calcium ruthenate; insulator to metal transition; mott insulator