Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Unconventional Superconductors
TT 22.2: Vortrag
Mittwoch, 7. September 2022, 15:30–15:45, H10
Optimization of Sr2RuO4 thin films and devices based on single-crystals flakes — •Priyana Puliyappara Babu1, Roman Hartmann1, Sohaila Zaghloul Noby1, Elke Scheer1, Angelo Di Bernardo1, Rosalba Fittipaldi2, and Antonio Vecchione2 — 1University of Konstanz, 78457 Konstanz, Germany — 2University of Salerno, 84084 Fisciano, Italy
Since its discovery in 1994, Sr2RuO4 has been the subject of intensive studies aiming at shedding light on the nature of its superconducting order parameter (OP). Despite earlier reports suggesting an unconventional nature of the Sr2RuO4 superconductivity, conflicting results have been recently reported and a definitive conclusion about the superconducting OP symmetry has not been yet achieved.
To address some of the open questions, it is crucial to fabricate superconducting devices based on high-quality superconducting thin films of Sr2RuO4. Thin films of Sr2RuO4 with very low density of defects, high residual resistivity ratio (> 30) and fully metallic down to low temperatures have been grown from single crystal target of Sr3Ru2O7. The growth parameters that can be further optimized to get fully superconducting thin films have also been identified. In parallel, we are also fabricating superconducting devices based on Sr2RuO4 flakes produced by mechanical exfoliation of single crystals. Different fabrication routes involving lithography patterning followed by Inductively Coupled Plasma (ICP) etching and patterning with a helium ion microscope have been successfully employed to fabricate superconducting devices from Sr2RuO4 single-crystal flakes.