Role of substitutional iron atoms affecting the paramagnon scattering in Co2Y

The electrical resistivity and the magnetization were measured from 4.2 K to room temperature in the compounds (Cosub(1-x)Fesub(x))2Y (x=0-0.03%), with the MgCu2-type structure. A fairly large temperature variation of resistivity in the compound with x=0 seems to be due to the paramagnon scattering. The magnetic susceptibility of (Cosub(1-x)Fesub(x))2Y with x>0 is expressed as the sum of two contributions due to the Pauli paramagnetic Co2Y matrix and to the iron atoms having magnetic moments of 6.4-7.0μsub(B). The resistivity measurements suggest that the paramagnon scattering is suppressed by the substitutional iron atom, which forms a magnetic cluster with surrounding cobalt atoms. (Auth.)