Abstract
RNi 4Si (R = rare earth) compounds have been studied by means of the X-ray powder diffraction, magnetization and magnetic susceptibility measurements. These compounds crystallize in the hexagonal CaCu 5-type of structure, space group P6/ mmm. Apart from La, Ce, Pr and Yb, these compounds order ferromagnetically between 5.7 K (Tm) and 22 K (Gd). A strong thermomagnetic irreversibility is observed, i.e., the temperature dependence of the magnetic moment is different in the zero-field cooling (ZFC) and field-cooling (FC) mode. The difference between the ZFC and FC magnetization curves could be induced by the magnetocrystalline anisotropy of the R ion.
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