MAGNETIC-PROPERTIES OF LACO5-XNIX

The densities of states for LaCo5-xNix substitutional compounds were c omputed using the Haydock recursion method in a self-consistent proced ure. The local magnetic moments were calculated for Co sites for which the Stoner criterion for ferromagnetism was found to be fulfilled. Th e decrease in magnetic moments with increasing Ni concentration is exp lained by the changes induced in the density of states by the added Ni atoms and the decrease in exchange splitting. The transition temperat ures were computed in the framework of the spin fluctuation theory, th e Stoner parameter decreasing with an increase in Ni concentration.