Informal seminar by Dr Eva Benckiser – MPI Stuttgart, Orbitals and spins in nickel oxide superlattices

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Date(s) - 15/01/2015
14 h 00 min - 15 h 00 min

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Ecole de Physique, room MaNEP, 24 quai Ernest-Ansermet

Orbitals and spins in nickel oxide superlattices

Dr Eva Benckiser
MPI Stuttgart

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.

 

Réalisation : Sur Mesure concept