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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Properties and Electronic Structure I
TT 5.1: Vortrag
Montag, 17. März 2025, 09:30–09:45, H36
Superconducting properties of [(SnSe)1+δ]m[NbSe2] superlattices with varying NbSe2 interlayer spacing — •Linus P. Grote1, Wieland G. Stoffel1, Tom Herter-Lehmann1, Willi Vallant1, Alina Dietrich1, Olivio Chiatti1, Danielle Hamann2, David C. Johnson2, and Saskia F. Fischer1, 3 — 1Novel 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 layered superconductors understanding and controlling the coupling of superconducting layers is crucial due to its strong impact on their properties [1]. We examine the properties of [(SnSe)1+δ]m[NbSe2] superlattices, which allow for nearly arbitrary stacking sequences due to the growth technique [2]. Given this degree of freedom we study how coupling mechanisms enable the occurance of superconductivity. Temperature-dependent resistance measurements revealed superconductivity for NbSe2 interlayer distances of 2.4 nm or smaller. This behaviour is explained by the interplay of grain boundaries, cross-plane tunneling and systematical variation of the NbSe2 interlayer distances. Additionally, magnetoresistance hysteresis measurements were conducted to investigate the charge carrier states and microscopic superconducting structures. The results provide new insights into the coupling mechanisms of 2D superconductors.
[1] O. Chiatti et al., J. Phys.: Condens. Matter 35, 215701 (2023);
[2] C. Grosse et al., Sci. Rep. 6, 33457 (2016).
Keywords: NbSe2 monolayers; Transition metal dichalcogenides; Superconductivity; TMDC superlattice; Interlayer coupling