Heavy fermions in a high magnetic field

Heavy-fermion systems are intermetallic materials composed of rare earth (Ce, Yb) or actinides (U, Np, Pu) elements. In these systems, partially filled 4f- or 5f-electron orbitals are strongly-coupled to conduction-electron bands. We give an overview on experimental studies performed in the last 25 years on heavy fermion systems in a high magnetic field. The properties of field-induced magnetic transitions in heavy-fermion materials close to a quantum antiferromagnetic-to-paramagnetic instability are presented. Effects of a high magnetic field to the Fermi surface, in particular the splitting of spin-up and spin-down bands, are also considered. Finally, we review on recent advances on the study of non-centrosymmetric compounds and ferromagnetic superconductors in a high magnetic field