Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 26: Layer Properties: Electrical, Optical, and Mechanical Properties
DS 26.5: Vortrag
Mittwoch, 18. März 2015, 16:00–16:15, H 2032
Structural and electrical characterization of the ferecrystals [(SnSe)1+δ]m(NbSe2)1 — •Corinna Grosse1, Matti Alemayehu2, Olivio Chiatti1, Anna Mogilatenko1,3, David C. Johnson2, and Saskia F. Fischer1 — 1Novel Materials, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Department of Chemistry, University of Oregon, Eugene, OR, 97401, USA — 3Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
Ferecrystals are layered intergrowth compounds consisting of few-atomic-layers thin transition metal dichalcogenide (TMDC) layers alternately stacked with monochalcogenide layers. TMDCs exhibit interesting electrical properties such as charge density waves, superconductivity or an ultralow thermal conductivity. In contrast to conventional misfit layer compounds, ferecrystals show a turbostratic disorder and have a freely tunable stacking sequence.
In this work, we investigate the structural and electrical properties of [(SnSe)1+δ]m(NbSe2)1 ferecrystals as a function of the thickness of the SnSe layers separating single NbSe2 layers. The atomic structure of the thin films was visualized using scanning transmission electron microscopy. In-plane resistivity, Hall coefficient and magnetoresistance were measured for temperatures down to 300 mK. The magnetoresistance measurements were analyzed using a two-band model. A superconducting transition is observed and the in-plane and cross-plane coherence lengths of superconductivity were determined. The influence of the ferecrystal structure on the electrical properties is discussed.