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DS: Fachverband Dünne Schichten

DS 9: Layer Properties: Electrical, Optical, and Mechanical Properties

DS 9.7: Vortrag

Dienstag, 1. April 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).