Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 53: Poster Session: Superconductivity 1

TT 53.2: Poster

Wednesday, March 22, 2017, 15:00–19:00, P2-OG2

Superconducting properties of [(SnSe)_1+δ]_m[NbSe₂]₁ ferecrystals — •Martina Trahms¹, Corinna Grosse¹, Olivio Chiatti¹, Kyle Hite², Matti B. Alemayehu², Dave J. Johnson², and Saskia F. Fischer¹ — ¹Novel Materials Group, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — ²Department of Chemistry and Material Science Institute, University of Oregon, Eugene, Oregon 97403, United States

Recently much attention has been paid to the electrical properties of monolayers of the superconducting transition metal dichalcogenide NbSe₂ and especially on the influence of the dimensional cross-over. Because thin films are very sensitive to external influences, buried superconducting layers such as ferecrystals are of great interest. Ferecrystals are turbostratically disordered layered systems in which the involved materials are alternately stacked in a repeated sequence. This experimental work investigates the Ginzburg-Landau coherence length of [(SnSe)_1+δ]_m[NbSe₂]₁ ferecrystals. In particular, whether two dimensional superconductivity can be established in these systems. By changing the SnSe content between 1 and 6 bilayers of SnSe, the distance of the superconducting NbSe₂ monolayers was increased, resulting in repeat unit distances between 1.25 nm and 4.14 nm. The coupling of the NbSe₂ layers was investigated by determining the out-of-plane Ginzburg-Landau coherence lengths by electrical transport measurements in a magnetic field closely below the transition temperature. A dimensional cross-over could not be identified; however, a decoupling trend with increasing distance of the NbSe₂ layers was observed.