MAGNETIC-PROPERTIES OF THE (SC1-XTIX)FE2 SYSTEM HAVING 2 MAGNETIC STATES WITH DIFFERENT DEGREES OF LOCALIZATION

Magnetization and Mossbauer measurements reveal that hexagonal Laves phase compounds Sc//1// minus //xTi//xFe//1//. //9//5 with 0. 3 less than x less than 0. 7 have two ferromagnetic states with different degrees of localization. The magnetic transition from one ferromagnetic state to the other more delocalized state takes place at approximately 70 K with increasing temperature in Sc//0//. //3//5Ti//0//. //6//5Fe//1//. //9//5 with T//c equals 360 K. At 500 K the magnetic state changes again to the more localized state with a smaller effective paramagnetic moment. The unit cell volume discontinuously decreases by approximately 1. 1% at approximately 70 K and its temperature analyzed with universal exp derivative becomes small at approximately 500 K with increasing temperature. The results were analyzed with universal expressions derived from the spin fluctuation theory by Moriya for the magnetic susceptibility and the average of the squared local amplitude of spin fluctuation.