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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.4: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Vortex effects in a superconducting [(SnSe)1+δ]3[NbSe2]1 Van-der-Waals superlattice — •Wieland G. Stoffel1, Linus Grote1, Mahni Müller1, Theodor Griffin1, Olivio Chiatti1, Danielle Hamann2, David C. Johnson2, and Saskia F. Fischer1,31Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Department of Chemistry and Materials Science Institute, University of Oregon, Eugene OR 97403, USA — 3Center for the Science of Materials Berlin, 12489 Berlin, Germany

In recent years, many materials have shown a transition between 2D and 3D superconducting behaviour [1]. Layered superconductors provide a promising framework to study those transitions. A new approach to understanding the interplay between the layers are ferecrystals, which are a Van-der-Waals bound composites of superconducting layers and spacers (here: NbSe2 and SnSe) [2].

In this work we characterise the collapse of the superconducting state of a [(SnSe)1+δ]3[NbSe2]1 ferecrystal in terms of the critical current, temperature, and magnetic field. This enables the determination of both the in-plane and out-of-plane Ginzburg-Landau coherence length, as well as the observation of effects on the IV-characteristic caused by the formation of vortices. These effects are analysed in terms of a Berezinskii-Kosterlitz-Thouless transition and the formation of phase-slip lines. The latter also explains an anomaly in the temperature dependence of the critical currents.

[1] C. Parra et al., Proc. Natl. Acad. Sci. 118.16 (2021)

[2] O. Chiatti et al., J. Phys. Condens. Matter 35 215701 (2023)

Keywords: Transition metal dichalcogenides; Superconductivity; BKT transition; Phase slips; van der Waals superlattices

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