High-Field Magnetization Of Tmb4

The magnetization M of single crystalline TmB4 has been investigated in high magnetic fields up to 54 T and shows considerably anisotropic behavior. In the ordered antiferromagnetic state, the M for B parallel to [001] reaches the saturation magnetization M, at about 4 T accompanying with plateaux at 1/8 M-s and 1/2 M-s. On the other hand, for B parallel to [100] and [110], the 1/2 M-s state and the saturation of M were observed at much higher field above 30 T. The results are discussed in relation to the effects of magnetic frustration and the crystalline electric field.