Microwave Spectroscopy on the Skin Effect of Heavy Fermion Metals using Stripline Resonators Physics

heavy fermion metals, correlated electron systems, skin effect, quantum criticality Kumpula campus library Heavy fermion materials are intermetallic compounds whose electronic properties exhibit a variety of anomalous effects at low temperatures. These effects emerge from the interplay between strong magnetic moments of localized f-electrons and the conduction electrons of the compound. Due to complex many-body interactions, these electron systems are said to be strongly correlated. At low temperatures the wave functions of the conduction electrons and the f-electrons hybridize, giving rise to a ’heavy ’ charge carrier with an effective mass even a hundred or a thousand times the free electron mass. Magnetic interactions of the electrons create a stage of magnetic ordering or disordering, superconductivity in some compounds, quantum critical phase changes and experimentally observed deviations from the so-called Fermi liquid theory that describes strongly interacting fermions at low temperatures. In fact, deviations from the Fermi liquid theory have for long been an interest in solid state physics, since the underlying mechanism is not understood. One of the main motivators for understanding unconventional behaviour of fermionic ensembles has been the discovery of high-temperature superconductivity, as well as explaining electronic correlations and quantum critica