Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Poster Session I
DS 36.12: Poster
Donnerstag, 19. März 2015, 09:30–12:00, Poster A
Suppressing a Charge Density Wave by Changing Dimensionality in the Ferecrystalline Compounds ([SnSe]1.15)1(VSe2)n with n = 1, 2, 3, 4 — Andreas Fiedler1, Matthias Falmbigl2, David C. Johnson2, and •Saskia F. Fischer1 — 1Novel Materials, Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Department of Chemistry, University of Oregon, Eugene OR 97401-3753, USA
The compounds, ([SnSe]1.15)1(VSe2)n with n = 1, 2, 3, and 4, were prepared using designed precursors in order to investigate the influence of the thickness of the VSe2 constituent on the charge density wave transition found in [1]. The structure of each of the compounds was confirmed by X-ray diffraction and scanning-transmission electron microscopy. The charge density wave transition observed in the resistivity of ([SnSe]1.15)1(VSe2)1 was confirmed and is suppressed as the layer thickness of the VSe2 constituent is increased beyond a single layer. The temperature of the resistivity minimum systematically increases from 118 K (n = 1) to 172 K (n = 3). For n = 1 this temperature correlates with the charge density wave transition temperature. The Hall-coefficient also changes sign when n is greater than 1, reflecting the abrupt difference in electronic properties on increasing the thickness of the VSe2 layer beyond a single layer.
[1] Atkins, R. et al.: Chem. Mater., 26 (9), 2862−2872, (2014).