Abstract
The magnetic structure of the compound DyNiSi 2 (CeNiSi 2 type of structure) has been studied by neutron diffraction and magnetic measurements. The paramagnetic neutron data confirmed the structure reported earlier for this compound. The analysis of the data collected in the magnetically ordered regime ( T N=24 K) showed the occurence of a two step magnetic ordering described by the presence of three wave vectors. In a very narrow region immediately below T N the ordering is described by a transversal sine wave modulated structure associated with the wave vector q 2=1/5 b*. Below 22 K a phase transition takes place manifested by the appearance of higher harmonics pertaining to the wave vectors q 1=(010)=5 q 2 and q 3=3 q 2. The I( q 1) intensities increase at the cost of the I( q 2) and I( q 3) ones. The intensities I( q 1) and I( q 2) coexist down to 1.5 K in varying proportions while the only very weak reflection of q 3 disappears down to 1.5 K. The wave vector q 1=(010) pertains to a collinear moment arrangement of the Dy moments along c with the magnetic space group C P (22′2 1′/m′cm)i′ S 57 391. The refined moment value at 1.5 K is μ Dy=7.5(1) μ B.
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