Coupling and Competition of Multiple Orders – COCOM

Electronic correlations are at the origin of many remarkable properties in solid state physics. In some materials several orders can coexist, couple or compete, giving rise to new properties. The case of the 123 family of compounds, embodied by BaFe2Se3, is one of these. It is multiferroic close to room temperature (256K) and described as a special Mott insulator. Under pressure, it undergoes an insulator-to-metal transition to become a superconductor. This project proposes to study all these orders and their interdependence in order to derive general information on highly correlated systems, multiple orders and their evolution according to various parameters: pressure, fields, temperature and doping.