Magnetic Properties and Magnetic Structure of $DyCoSi_2$ Compound

The results of new magnetic dc and neutron diffraction measurements of $DyCoSi_2$ compound are presented. Below $T_{N}$ equal to 10.9 K the Dy moments form collinear G-type structure with the moment parallel to the c-axis. The value of Dy-moment equal to 5.5(2) $μ_{B}$ are smaller than free $Dy^{3+}$ ion value (10.0 $μ_{B}$). These and the three-step magnetization process indicate the strong influence of the crystal electric field on the stability of the magnetic order. Increase of the values of the lattice parameters at 1.5 K in reference of these at 20 K indicate magnetostriction effect at low temperatures.