Resonant soft x-ray scattering studies of electronic orders in transition metal oxides and related heterostructures.

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The aim of the present application is the experimental investigation of electronic properties of films and heterostructures by means of novel resonant scattering experiments. The focus here are the electronic properties of manganese oxides and their modification at the interfaces in artificial heterostructures. The experimental methodology is based on the resonant elastic scattering of soft X-rays. The central aims of the planned scattering experiments are to clarify the following: (i) the impact of epitaxial and in-situ induced structural strain on the electronic ordering in doped manganites, (ii) the interplay of superconductivity and ferromagnetism at interfaces in YBaCu2O7-d/La(1-x)Ca(x)MnO3 heterostructures, and (iii) the antiferromagnetic interlayer coupling in La(1-x)Sr(x)MnO3/SrRuO3 heterostructures.In the course of this study, newly developed approaches to the analysis of resonant x-ray reflectivity will be applied. These approaches have been developed during the first funding period and now enable to extract very precisely the electronic properties of buried interfaces with unknown optical properties. The accurate understanding of the effects mentioned above is not only of great interest for fundamental research, but is essential for possible technological applications.