Spin-density-wave clusters in PdMn spin-glass alloys

PdMn disordered alloys with concentrations above 5 at. % Mn display characteristic properties of spin glasses. We report here neutron-diffraction data for Pd₉₀Mn₁₀ and Pd₈₀Mn₂₀ single crystals. Satellite diffuse peaks were observed for both specimens at the (1±δ00) positions (δ=0.37 for Pd₉₀Mn₁₀ and δ=0.16 for Pd₈₀Mn₂₀) accompanied with the atomic-short-range-order peak at (1 0 0). These satellites disappear at temperatures far above the freezing temperature TF. The origin of the spin-glass-like behavior in PdMn alloys can be ascribed to the dynamics of the fluctuating spin-density-wave clusters just as observed in CuMn alloys. Various properties observed here are compared with those of CuMn alloys.