Correlated electron systems at high magnetic fields

High magnetic fields are one of the most powerful tools available to scientists for the study, modification, and control of the state of matter. The application of magnetic fields, therefore, has become a commonly used instrument for condensed-matter physics. For the observation of many phenomena very high magnetic fields are essential. Consequently, the demand for the highest possible magnetic-field strengths is increasing. At the Dresden High Magnetic Field Laboratory (HLD), that has just opened its doors for external users, pulsed magnetic fields up to 70 T are available and the ambitious goal of reaching 100 T has been set. Here, I will present the current status of the HLD and discuss some scientific results recently obtained at high magnetic fields. This covers e.g. the clear thermodynamic evidence for the existence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in a layered organic superconductor, the magnetic-field-induced change of the electronic band structure in the metal CeBiPt, and finally the determination of the band- and angle-resolved superconducting coupling strength in a borocarbide superconductor.