Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 27: 2D Materials beyond Graphene (jointly with O)
DS 27.2: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-EG
X-ray absorption spectroscopy studies on transition metal dichalcogenide heterointerfaces — •Florian Rasch1, Sage Bauers2, Danielle Hamann2, Gavin Mitchson2, Kyle Hite2, Javier Herrero-Martín3, Manuel Valvidares3, David Johnson2, Bernd Büchner1, and Jorge Hamann-Borrero1 — 1Leibniz Institute for Solid State and Materials Research Dresden, Dresden, Germany — 2Department of Chemistry and Materials Science, University of Oregon, Eugene, Oregon, United States — 3ALBA Synchrotron Light Source, Cerdanyola del Vallès, Barcelona, Spain
Transition metal dichalcogenides (TMD) are layered quasi 2D materials that exhibit exciting physical phenomena such as superconductivity (SC) and charge density waves (CDW), which strongly depend on the TMD dimensionality. In order to study the effect of dimensionality on the electronic properties of TMD a series of ferecrystal heterostructures with chemical formula [(MSe)m /(TSe2)n]k (M = Sn, Pb, Bi and T = V, Nb, Ti) were synthesized with precise control of the dimensionality, i.e. m and n. Additionally, study of the charge transfer (CT) into the dichalcogenide layer is possible by changing the M cation. Here we present a X-ray absorption spectroscopy (XAS) study at the transition metal L2,3 edges for (PbSe)1/(VSe2)n (with n = 1, 3), as well as (MSe)1/(NbSe2)1 and (MSe)1/(TiSe2)1 (with M = Sn, Pb, Bi) heterostructures at temperatures below and above TCDW. Our experiments clearly show strong changes of the transition metal XAS spectra by changing the M ion. Moreover, X-ray magnetic circular dichroism reveals weak magnetism for samples containing Ti and V.