Fermi surface and magnetic properties of PrTIn₅ (T: Co, Rh, and Ir)

We grew single crystals of PrCoIn₅, PrRhIn₅, and PrIrIn₅ with the tetragonal crystal structure and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen effect. These Pr compounds reveal no magnetic ordering. The topology of the Fermi surfaces is the same as that of a non-4f reference compound LaRhIn₅. The cyclotron mass and/or the electronic specific heat coefficient are also approximately the same as those of LaRhIn₅. The magnetic susceptibility and magnetization are anisotropic, reflecting the crystal structure, which are well explained by the tetragonal crystalline electric field scheme with the singlet ground state.