Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.25: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Electrical transport studies of the turbostratically disordered ([SnSe]_1+δ)_m(NbSe₂)₁ misfit layer compounds — •Georg Hoffmann¹, Corinna Grosse¹, Andreas Fiedler¹, Matti B. Alemayehu², David C. Johnson², and Saskia F. Fischer¹ — ¹Neue Materialien, Institut für Physik, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — ²Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, United States

The control of material properties by combining layers with different properties is of great interest in the field of quasi-two-dimensional multilayer-systems. The turbostratically disordered misfit layer compounds, so called ferecrystals, have been established as promising novel materials, whose electric and magnetic properties can be systematically controlled by changing the stacking sequence. The effect of systematically increasing the SnSe layer thickness on the magnetoelectric transport is studied for ([SnSe]_1+δ)_m(NbSe₂)₁ between 2 K and 300 K. The Hall coefficient and the resistivity increase with increasing m (number of SnSe layers between each NbSe₂ layer). While the temperature dependence of ([SnSe]_1+δ)₁(NbSe₂)₁ is metallic, the measurements reveal an unexpected increase of the resistivity with decreasing temperatures below 20 K for m>1. The increase of the resistivity increases with higher m. The Hall coefficient decreases with increasing temperature between 4.2 K and 50 K. Above 50 K the Hall coefficient increases with increasing temperature for m>1. The influence of the stacking sequence is discussed.