Atomic and magnetic short-range order in PdMn

Nuclear diffuse neutron scattering measurements are performed on PdMn. The Warren-Cowley atomic short-range order parameters αsub(i) are determined up to the third neighbour (i=1,2,3) for four different heat treatments of the specimen. Additional triple-axis neutron scattering measurements show a large inelastic contribution at room temperature. Susceptibility measurements are also carried out on these specimens, and these show a large dependence of the spin-glass freezing temperature Tsub(f) on the specimen treatments. The magnetic correlation function sub(X)(T)T is determined from the high-temperature (T > Tsub(f)) susceptibility and analysed with a configuration group model which includes the measured Warren-Cowley parameters. From this analysis the exchange parameters Jsub(i) are calculated up to the sixth neighbour. (author)