Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Electronic Structure of Surfaces II

O 88.10: Vortrag

Donnerstag, 4. April 2019, 17:15–17:30, H26

Controlling fundamental electronic interactions in SrTiO3 thin films by Ni and Fe doping — •Fatima Alarab^1,2, Berengar Leikert³, Laurent Nicolai², Lucie Prusakova², Pavol Sutta², Ralph Claessen³, Jan Minar², and Karol Hricovini¹ — ¹Cergy-Pontoise University, Neuville, France — ²University of West Bohemia, Plzen, Czech Republic — ³University of Würzburg, Würzburg, Germany

Strontium titanate (SrTiO3) has been a subject of intensive discussion in recent years both experimentally as well as theoretically. Strontium titanate is an insolator with a large band gap (Eg=3.2 eV), but it can become conductive by doping with transition metals or oxygen vacancies [1]. Here we report the fabrication and electronic properties of Ni doped SrTiO3 polycrystalline and crystalline films. The polycrystalline films were prepared by reactive magnetron co-sputtering in a reactive magnetron units equipped by pure STO and Ni targets with different Ni concentration. Whereas the crystalline films were grown by pulsed laser deposition (PLD). In this experimental investigation, we used high energy ARPES, core level spectroscopy and XPD to perform the electronic properties of the films as a function of doping concentration. Our experimental results were supported by ab-initio calculations using SPR-KKR's one-step model of photoemission [2,3].

[1] F. Alarab et al., AIP Conference Proceedings 1996, 020001 (2018). [2] Braun, Rep. Prog. Phys. 59, 1267-1338 (1996). [3] H. Ebert, D. Kodderitzsch and J. Minar, Rep. on Prog. in Phys. 74, 096501 (2011).