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DS: Fachverband Dünne Schichten
DS 9: Layer Properties: Electrical, Optical, and Mechanical Properties
DS 9.7: Talk
Tuesday, April 1, 2014, 11:45–12:00, CHE 91
Structural and Electrical Characterization of the Ferecrystals [(PbSe)1.14]m(NbSe2)n — •Corinna Grosse1, Matti Alemayehu2, Olivio Chiatti1, Anna Mogilatenko1, 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
Ferecrystals are layered intergrowth compounds consisting of alternating few-atomic-layers thin sheets of transition metal dichalcogenide (TMD) and metal chalcogenide layers. TMDs exhibit interesting electrical properties such as charge density waves, superconductivity or an ultralow thermal conductivity [1]. In contrast to conventional misfit layer compounds, ferecrystals exhibit a turbostratically disordered structure and their layer thickness and stacking sequence are tunable.
In this study, we synthesized the ferecrystals [(PbSe)1.14]m(NbSe2)n and measured their in-plane electrical properties as a function of layer sequence (m and n) and temperature (down to T = 300 mK). The crystal structure was analyzed using X-ray- and electron diffraction, scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. The structure of the PbSe and NbSe2 constituents was resolved down to the atomic scale. The influence of the ferecrystal structure on the electrical properties is discussed. [1] C. Chiritescu, D. G. Cahill, N. Nguyen, D. C. Johnson et al., Science 315, 351 (2007).