Magnetic and electrical properties of the R(Co, Si) compounds (R = Gd, Tb, Dy) with invariable crysta2l unit cell parameters

Abstract

The invariable crystal unit cell parameter compounds R(Co, Si)2 (R = Gd, Tb and Dy) have been studied by mean of the magnetization, ac susceptibility and resistivity measurements. By partial substitution Co by Si, the ordering temperature is almost constant for all of the considered compounds, whereas the reduction of the 3d magnetic moment is observed. In the condition of fixed volume, these findings suggest the important effects of the hybridization between the 3d states of Co and the p states of Si. The anomalies of magnetization, susceptibility, resistivity and the character of the magnetic phase transition at Tc are also discussed for the compounds with Dy.