Sökning: "antiferromagnetism"
Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet antiferromagnetism.
1. Chemical Tuning of the Magnetic Interactions in Layer Structures
Sammanfattning : Thin metal films have found their use in many magnetic devices. They form pseudo two-dimensional systems, where the mechanisms for the magnetic interactions between the layers are not completely understood. LÄS MER
2. Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides
Sammanfattning : Synthesis, nuclear structure, and magnetic properties of the perovskites: Nd0.7-xMgxSr0.3MnO3 (x=0.0, 0. LÄS MER
3. Two-dimensional antiferromagnetism : from Schwinger bosons to spin waves
Sammanfattning : .... LÄS MER
4. Neutron spectroscopy studies of vibrational and diffusional dynamics in organometal halide and oxyhydride perovskites
Sammanfattning : This thesis deals with inelastic and quasielastic neutron scattering studies on the dynamical properties of the organometal halide perovskite system MA1-xFAxPbI3 (MA = methylammonium; FA = formamidinium) and of the layered perovskite-type oxyhydride SrVO2H. These materials systems are of high interest for their excellent photovoltaic performance (MA1-xFAxPbI3) and hydride-ion conductivity (SrVO2H) and concomitant promise for various technological devices; however, the local structure and dynamics underpinning these materials properties remain unclear. LÄS MER
5. Phase transitions in high-temperature superconductors
Sammanfattning : Thermal fluctuations and disorder strongly influence the behaviour of hightemperature superconductors. In particular the vortices play a key role in determining their properties. In this thesis the main focus lies on phase transitions, both in ultra-thin films and in three-dimensional systems, which are driven by vortex fluctuations. LÄS MER