Abstract

While the dynamics of independent electrons are textbook knowledge, the inclusion of electronic correlations adds a new degree of complexity that can lead to new and unexpected macroscopic behaviour. Such novel phenomena are fundamentally interesting in their own right, but some can also be harnessed for device applications. Knowledge of the electronic structure of correlated materials is pivotal to explaining their unusual properties, and in my talk I will describe experiments that have established the Fermi surface and quantified the degree of band renormalisation of several correlated electron metals of recent interest. These showpiece examples include the possible p-wave superconductor Sr2RuO4, the metamagnetic heavy fermion compound CeRu2Si2, and Ag5Pb2O6 for which we recently found the most spherical Fermi surface ever seen in any superconductor. I will also describe how we plan to exploit recent technological advances – notably in silicon micromachining (MEMS) – to push the sensitivity limits under the very extreme conditions of the highest magnetic fields, very low temperatures, and high pressures.