08 Fakultät Mathematik und Physik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/9
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Item Open Access Growth and characterization of transition metal oxide heterostructures with a tailored work function(2018) Rastegar Alam, Iman; Mannhart, Jochen (Prof. Dr.)Item Open Access X-ray and Raman scattering studies of novel phases in 3d and 4d transition metal oxides(2020) Fürsich, Katrin; Keimer, Bernhard (Prof. Dr.)Item Open Access Synthesis and electronic ordering phenomena of calcium ruthenate thin films(2018) Dietl, Christopher Johannes; Keimer, Bernhard (Prof. Dr.)Item Open Access Effiziente Energiekonversion basierend auf atomar kontrollierten Heterostrukturen(2019) Voesch, Wolfgang; Mannhart, Jochen (Prof. Dr.)Item Open Access Terahertz and infrared spectroscopy of thin film cuprate superconductors(2021) Dawson, Robert David; Keimer, Bernhard (Prof. Dr.)Item Open Access Scanning tunneling microscopy of superconductors and high field electron spin resonance(2023) Uhl, Maximilian; Ast, Christian R. (Priv.-Doz. Dr.)Electron spin resonance on the single atom level is demonstrated with a scanning tunneling microscope (STM) in a frequency range from 60 to 100 GHz. For the irradiation of the high frequency signal, an external antenna has been built into the STM. Advanced methods for the signal's transfer function compensation have been developed. Furthermore, the multiband Josephson effect is analyzed for the type I two-band superconductor Pb for different tip-sample distances. The consideration of the interaction with the local electromagnetic environment and multiple Andreev reflections allows for the extraction of multiple microscopic parameters.Item Open Access Critical magnetic fluctuations in strongly electron-correlated systems(2022) Trepka, Heiko; Keimer, Bernhard (Prof. Dr.)In this work, we use high-resolution neutron Triple-Axis and Spin-echo spectroscopy to study the critical properties of the strongly electron-correlated 4d square-lattice antiferromagnets Ca2RuO4 and Ca3Ru2O7, as well as of the heavy-fermion system CeCu5.8Au0.2 in vicinity and above the Néel-temperatures TN. We extract static and dynamical critical exponents to determine the spin dimensionalities and relevant anisotropies. We find that the critical behaviors of the single-layer compound Ca2RuO4 follow universal scaling laws that are compatible with predictions of the 2D-XY model. The bilayer compound Ca3Ru2O7 is only partly consistent with the 2D-XY theory and best described by the 3D-Ising model, which is likely a consequence of the intra-bilayer exchange interactions in combination with an orthorhombic single-ion anisotropy. For CeCu5.8Au0.2 we find signatures of a quantum-to-classical crossover in the dynamic scaling behavior.