SPIN FLUCTUATION IN YCO2-BASED COMPOUNDS

The magnetic properties of Y(CoxNi1-x)(2) compounds were investigated in the temperature range of 5-800 K and fields up to 8 T. Magnetic sus ceptibilities of Y(CoxNi1-x)(2) compounds with x = 1.0 and 0.8, at T l ess than or equal to 15 K, are described by a T-2 dependence. The temp erature range where this behavior is evidenced is gradually diminished as the nickel content increases. At high temperatures, the compounds with x greater than or equal to 0.2 show a Curie-Weiss type behavior. The effective cobalt moments decrease slightly when increasing nickel content. The magnetic behavior of the above system is analyzed in a sp in fluctuation model. (C) 1998 American Institute of Physics. [S0021-8 979(98)00303-X].