Day / Time
Date(s) - 15/01/2015
14 h 00 min - 15 h 00 min
Ecole de Physique, room MaNEP, 24 quai Ernest-Ansermet
Orbitals and spins in nickel oxide superlattices
Dr Eva Benckiser
The occupation of /d/-orbitals has a key influence on the physical properties of transition metal oxides. In particular heterostructures of these materials raised the promise to manipulate the orbital occupation via biaxial strain, confinement and interfacial effects.
We have investigated a series of perovskite-type /R/NiO_3 -based superlattices (/R/=La, Pr) by linear polarized resonant soft x-ray scattering and reflectometry to probe atomic-scale modulations of the orbital occupation in a quantitative manner and to uncover the unusual antiferromagnetic order of the /R/NiO_3 layers in the two-dimensional limit. Our results give an insight to the strain, composition and thickness dependence of orbital occupation and spin order which we discuss in context with recent theoretical predictions.