Ising-Type Magnetic Anisotropy Derived by Γ7(1) Crystal Electric Field Ground State in Tetragonal CeRu2Al2B: 11B and 27Al NMR Studies

The magnetic properties of the new tetragonal compound CeRu 2 Al 2 B have been investigated by 11 B and 27 Al nuclear magnetic resonance (NMR) measurements. In the paramagnetic state, the Knight shift exhibits a strong Ising-type magnetic anisotropy. In the ferromagnetic order state, the ordered moment is estimated to be ≈1.8–1.85µ B /Ce from the magnitudes of the internal fields at the B and Al sites. These results strongly suggest that the Ising-like ferromagnetic ground state arises from the Γ 7 (1) ground state in CeRu 2 Al 2 B.