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Ordering Phenomena in Rare-Earth Nickelate Heterostructures
Matthias Hepting
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Springer International Publishing 
Naturwissenschaften, Medizin, Informatik, Technik / Maschinenbau, Fertigungstechnik
Beschreibung
This thesis presents an experimental study of ordering phenomena in rare-earth nickelate-based heterostructures by means of inelastic Raman light scattering and elastic resonant x-ray scattering (RXS). Further, it demonstrates that the amplitude ratio of magnetic moments at neighboring nickel sites can be accurately determined by RXS in combination with a correlated double cluster model, and controlled experimentally through structural pinning of the oxygen positions in the crystal lattice. The two key outcomes of the thesis are: (a) demonstrating full control over the charge/bond and spin order parameters in specifically designed praseodymium nickelate heterostructures and observation of a novel spin density wave phase in absence of the charge/bond order parameter, which confirms theoretical predictions of a spin density wave phase driven by spatial confinement of the conduction electrons; and (b) assessing the thickness-induced crossover between collinear and non-collinear spin structures in neodymium nickelate slabs, which is correctly predicted by drawing on density functional theory.
Kundenbewertungen
Strongly Correlated Electron Systems, Electronic Phase Transitions of Nickelate, Spatially Confined Conduction Electrons, Magnetic Resonant Elastic X-Ray Scattering, Raman Spectroscopy on Thin Films, Spin Density Wave Phases, Magnetic Phase Transitions of Nickelate