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In this thesis chemical and epitaxial degrees of freedom are used to manipulate charge and spin ordering phenomena in two families of transition metal oxides, while taking advantage of state-of-the-art resonant x-ray scattering (RXS) methods to characterize their microscopic origin in a comprehensive manner. First, the relationship of charge density wave order to both magnetism and the "pseudogap" phenomenon is systematically examined as a function of charge-carrier doping and isovalent chemical substitution in single crystals of a copper oxide high-temperature superconductor. Then, in copper oxide thin films, an unusual three-dimensionally long-range-ordered charge density wave state is discovered, which persists to much higher temperatures than charge-ordered states in other high-temperature superconductors. By combining crystallographic and spectroscopic measurements, the origin of this phenomenon is traced to the epitaxial relationship with the underlying substrate. This discovery opens new perspectives for the investigation of charge order and its influence on the electronic properties of the cuprates. In a separate set of RXS experiments on superlattices with alternating nickel and dysprosium oxides, several temperature- and magnetic-field-induced magnetic phase transitions are discovered. These observations are explained in a model based on transfer of magnetic order and magneto-crystalline anisotropy between the Ni and Dy subsystems, thus establishing a novel model system for the interplay between transition-metal and rare-earth magnetism.
Condensed matter. --- Chemistry. --- Crystallography. --- Materials—Surfaces. --- Thin films. --- Condensed Matter Physics. --- Chemistry/Food Science, general. --- Crystallography and Scattering Methods. --- Surfaces and Interfaces, Thin Films. --- Films, Thin --- Solid film --- Solid state electronics --- Solids --- Surfaces (Technology) --- Coatings --- Thick films --- Leptology --- Physical sciences --- Mineralogy --- Condensed materials --- Condensed media --- Condensed phase --- Materials, Condensed --- Media, Condensed --- Phase, Condensed --- Liquids --- Matter --- Superconductors --- Copper oxide --- Nickel oxide --- Analysis. --- Nickel monoxide --- Nickel(II) oxide --- Oxonickel --- Nickel compounds --- Oxides --- Metallic oxides
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solar energy conversion --- n/a --- carboxylic acid --- organic salts --- 2?:6? --- Cerium --- drug delivery --- layered materials --- coordination polymer --- copper --- solid state NMR --- metal–organic frameworks --- synthesis --- coordination polymers --- in situ characterisation --- mechanochemistry --- phosphonic acids --- amorphous --- nickel(II) oxide --- heterogeneous catalysis --- phosphonic acid --- MOF --- porosity --- phosphonate ester --- proton conduction --- X-ray and electron diffraction --- gas sorption/separation --- metal phosphonate --- electron diffraction tomography --- ionic compounds --- dye-sensitized solar cell --- 2?-terpyridine --- dye --- 2 --- rechargeable batteries --- anchor --- defects --- p-type --- crystal structure --- diphosphinate --- zinc(II) --- metal phosphonates and phosphinates --- metal-organic frameworks
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