INFLUENCE OF EXCHANGE BOND DISORDER ON THE MAGNETIC-PROPERTIES OF (PD1-XFEX)(95)MN-5 NEAR T-C

A summary of a detailed study of the field and temperature dependent a c susceptibility of a series of ternary (Pd1-xFex)(95)Mn-5 alloys near the ferromagnetic ordering temperature T-c is presented. By following the behavior of the crossover line (a line of maxima in the field dep endent susceptibility above T-c, the maxima moving upwards in temperat ure but decreasing in amplitude with increasing field) it is possible to catalog the influence of exchange bond disorder on aspects of the c ritical behavior. These ternary systems are not soft ferromagnets and thus asymptotic critical exponents are difficult to estimate using thi s technique. Nevertheless, effective exponents (i.e., obtained away fr om the critical point) clearly reflect the presence of significant var iance in the distribution of exchange bonds.