Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.6: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Superconducting properties of [(SnSe)1+δ]m∈[1,9][NbSe2]n=1 ferecrystals — •Theodor U. Griffin1, Martina Trahms1, Corinna Grosse1, Danielle Hamann2, Omar K. Hite2, Matti B. Alemayehu2, Olivio Chiatti1, David C. Johnson2, and Saskia F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Department of Chemistry, University of Oregon, Eugene, OR, 97401, USA
Ferecrystals are artificially layered materials that can be grown with atomically smooth layers in various sequences. Furthermore, as the layers are bound only through van der Waals interaction, strain due to lattice mismatch between layers is negligible and the material has turbostratic disorder. They can provide a model for naturally layered superconductors, including many high TC superconductors. They also allow embedding interesting monolayers and thin films in buffer material, protecting them from external influences.
Here, we used ferecrystals composed of monolayers of the superconducting transition-metal dichalcogenide NbSe2 and bilayers of the semiconductor SnSe. These layers are stacked in repeated sequences of a monolayer NbSe2 with between one and nine bilayers of SnSe. We investigate the electrical transport properties near the superconducting transition. The aim is to ascertain at which, if any, ratio of NbSe2 to SnSe the ferecrystals begin to show two-dimensional superconducting behaviour, using the angular dependence of the critical magnetic field. We hope to gain further insight into layered superconductors and 2D-superconductivity. For m<6, 3D behaviour was observed.