Keimer's department > Groups > Neutron & x-ray reflectometry
Magnetic and electronic properties of surfaces, interfaces and multilayers
Our group focuses on the experimental studies of magnetic and orbital properties of multilayers, superlattices, and interfaces. We use resonant x-ray and neutron reflectometry to investigate orbital and magnetic reconstructions at the interfaces of correlated oxide heterostructures, e.g. consisting of YBa2Cu3O6+y and La1−xCaxMnO3 or LaNiO3 and LaAlO3. In particular, we apply the newly developed method of orbital reflectometry to study spatially resolved orbital polarization profiles in adjacent atomic layers of transition-metal-oxide superlattices. We collaborate closely with other groups within Keimer's department, with the Andersen's theory department, Technology Service Group as well as with external groups within the TRR 80 collaboration.
Orbital reflectometry yields quantitative, depth-resolved orbital polarization profiles of metal-oxide multilayers. The figure shows polarization-dependent reflectivity data for a LaNiO3-LaAlO3 superlattice (left) compared to the corresponding simulated curves (right) for LaNiO3 layers with a homogeneous and modulated orbital occupation.
E. Benckiser et al., Nature Materials, 2011
See also: review article by H. Y. Hwang et al.