Ordering Phenomena in Rare-Earth Nickelate Heterostructures by Matthias Hepting

By Matthias Hepting

This thesis provides an experimental learn of ordering phenomena in rare-earth nickelate-based heterostructures via inelastic Raman gentle scattering and elastic resonant x-ray scattering (RXS). extra, it demonstrates that the amplitude ratio of magnetic moments at neighboring nickel websites might be correctly made up our minds by means of RXS together with a correlated double cluster version, and regulated experimentally via structural pinning of the oxygen positions within the crystal lattice. the 2 key results of the thesis are: (a) demonstrating complete regulate over the charge/bond and spin order parameters in particularly designed praseodymium nickelate heterostructures and statement of a singular spin density wave part in absence of the charge/bond order parameter, which confirms theoretical predictions of a spin density wave part pushed through spatial confinement of the conduction electrons; and (b) assessing the thickness-induced crossover among collinear and non-collinear spin constructions in neodymium nickelate slabs, that's adequately expected via drawing on density practical theory.

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