Hamburg 2001 – scientific programme

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DS: Dünne Schichten

DS 31: Postersitzung

DS 31.26: Poster

Tuesday, March 27, 2001, 16:30–17:30, Foyer Saal 4

Structural investigation of the Mo₆Se₈ Chevrel phases grown on a MoS₂ substrate by van der Waals epitaxy — •Ralf Severin, Thorsten Böker, Christoph Janowitz, and Recardo Manzke — Institut f. Physik, Humboldt-Universität zu Berlin, Invalidenstrasse 110

Mo₆Se₈ belong to the so called Chevrel phases which show superconductivity persistent to high critical field. In the present study high purity Mo and Se was evaporated in a new van der Waals epitaxy (vdWe) system by an electron beam evaporator and a Knudsen type effusion cell, respectively. The deposited films on a MoS₂ substrate were investigated by low energy electron diffraction (LEED), Auger electron spectroscopy (AES), and angular resolved photoelectron spectroscopy (ARPES). As a first result two different stoichiometric phases were identified for different growth parameters; there are MoSe₂ and Mo₆Se₈. The MoSe₂ film shows the typical layer-by-layer growth mode in contrast to the island growth of the Mo₆Se₈. For structural investigation we present new angular resolved LEED studies, X-ray diffraction measurements and STM pattern of the Mo₆Se₈ films.