Abstract
Magnetic experiments have been performed on single-crystalline TbCoC 2 and TbNiC 2 compounds. The magnetic behaviors of TbCoC 2 show that the magnetic structure below T C = 30 K is a simple collinear ferromagnetic one with the Tb moment of 8.45 μ B parallel to the a-axis. The various behaviours that appear in TbNiC 2 with T N = 27.0 K are unexpected considering the collinear antiferromagnetic structure reported previously. The M- T curve shows a sharp cusp along both the b and the c-axes. Two field-induced transitions are observed in the M- H curve along the c-axis below 12 K. Four transitions appear as the temperature approaches T N, and two of them continue to appear above T N . The field-induced transition is also observed in the M- H curve along the b-axis. The results are interpreted satisfactorily by postulating a noncollinear antiferromagnetic structure, where the Tb moment of 7.34μ B cants its direction from the c-axis toward the b-axis by an angle of 11°. A small spontaneous magnetization along the c-axis is explained by assuming a mismatched plane at a distance of 15.5 b.
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