Suppression of spin fluctuations and enhancement of the Curie temperature in compounds of the Sm2Fe17 type by introduction of atoms of nonmagnetic elements

Temperature dependences of magnetic properties of compounds based on Sm2Fe1 7 and Y2Fe17 are shown to he determined hy thermal fluctuations of electron spin density. The intra-atomic interaction of electrons leads to the appea rance of local magnetic moments and to ferromagnetic ordering: simultaneous ly, this interaction causes the high local spill susceptibility of d electr ons. which favors the appearance las temperature increases) of strong spin fluctuations lending to a decrease in the magnetization and transition into a disordered paramagnetic state. Addition of atoms of nonmagnetic elements (N, C, H, Al. Si) leads to a suppression of spin fluctuntions, which can s ignificantly increase the Curie temperature of ternary compounds.