The matgnetic properties of $Gd_xCe_{1-x}MnSi$ compounds

The magnetic properties of the $Gd_xCe_{1-x}MnSi$ system of rare-earth compounds were studied. The Neel temperatures $T_N$ were determined for alloys with a Gd concentration in the range $0\le x\le 0,4$ and the Curie temperature $Т_С$ of alloys with a Gd concentration $x\ge 0,5$. The magnetic moments per formula unit were calculated. The curves of specific magnetization $\sigma$ versus magnetic field have showed, in the $0,2 < x < 0,6$ range of Gd concentration, sections corresponding to the threshold fields $В_{th}$, where $\sigma$ starts to grow sharply. A magnetic phase diagram was plotted and regions of existence of ferri-, antiferro-, and paramagnetic states were deterinined. A model was proposed to explain the magnetic properties of the compound, which assumes that there exists an antiferromagnetic exchange interaction between the Mn layers and a ferrimagnetic ordering of the Mn magnetic monents and rare-earth ions.