SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 10: Layer Properties II
DS 10.1: Talk
Wednesday, March 29, 2023, 11:00–11:15, SCH A 316
Electronic structure of epitaxial (Cr1-xMnx)2GaC thin films by X-ray absorption and optical spectroscopy — •Ivan Tarasov1, Andrei Rogalev2, Fabrice Wilhelm2, Michael Farle1, and Ulf Wiedwald1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany — 2The European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France
Heteroepitaxial thin films of (Cr1-xMnx)2GaC MAX phase for x = of 0.13 - 1 were deposited on MgO(111), Al2O3(0001) and KAl3Si3O10(001) substrates by pulsed laser deposition at T = 500-600 °C. X-ray absorption near edge spectroscopy (XANES) spectra were collected at the Mn K-edge, Cr K-edge and Ga K-edge. Evidence of chemical disorder associated with (Mn, Cr) is observed. The similarity of the Cr K-edge spectra to Mn, and the presence of a strong X-ray linear dichroism signal for the Mn K-edge, indicates that Mn is substitutional for Cr in the MAX phase hexagonal lattice. With increasing of Mn content additional features attributed to a cubic antiperovskite structure are observed. Simulations of the XANES spectra confirm the origin of X-ray linear dichroism observed in the sample, which is due to the inherent nanolaminated structure of the MAX phase.
Funding by the Deutsche Forschungsgemeinschaft (DFG) within CRC/TRR 270, project B02 (Project-ID 405553726) is gratefully acknowledged. We thank Martina Schmid (University of Duisburg-Essen) for assistance and providing access to the ellipsometer.