Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DF: Fachverband Dielektrische Festkörper
DF 19: Poster 2
DF 19.10: Poster
Mittwoch, 13. März 2013, 15:00–17:30, Poster B2
Electronic Structure of Rare-Earth Scandates RScO3 (R= Pr, Nd, Sm, Eu, Gd, Tb, and Dy) — •Karsten Kuepper1, Christine Derks1, Andrei Postnikov2, Reinhard Uecker3, and Manfred Neumann1 — 1Department of Physics, University of Osnabrück, D-49069 Osnabrück — 2LCP-A2MC, University of Lorraine, F-57078 Metz, France — 3Institute for Crystal Growth, D-12489 Berlin
Scandium based double oxides with other rare earth lanthanides of type RScO3 (R=Pr,Nd,Sm,Eu,Gd,Tb, and Dy) find a number of potential interesting applications, first of all in its quality of a high dielectric constant (high-k) material. Here we present the results of a detailed electronic structure investigation, applying a number of complementary x-ray spectroscopic techniques, namely x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS), and x-ray emission spectroscopy (XES) in combination with theoretical LDA+U electronic structure calculations [1,2,3]. We find an overall excellent agreement between experiment and theory. Furthermore, we discuss a band gap variation in dependence of R, analyzed by means of O K XAS and XES [2].
[1] M. Raekers et al., Phys. Rev. B 79, 125114 (2009).
[2] C. Derks et al., Phys. Rev. B 86, 155124 (2012).
[3] A.V. Postnikov et al., Ferrolelectrics, in press.