electron systems in which charge carrier can have masses as large 1000 times the free electron mass. This large effective mass often derives from f orbitals of rare earth or actinide atoms. The ground state of heavy fermions is easily tuned and controlled with an external thermodynamic parameter. For instance, magnetic phases can be suppressed at a quantum phase transition with pressure or magnetic field.
Nous montrons ci-dessus le phénomène remarquable de la supraconductivité rentrante qui se produit autour d’une transition spin-rotation induite par le champ dans le diagramme de phase champ-température de l’URhGe.