Numerical results on the indirect exchange interaction in crystalline and amorphous metals

Computer simulation of the indirect exchange interaction is carried out for a single tight-binding s-band in ordered (simple cubic, body-centered cubic, face-centered cubic) and amorphous (relaxed dense-random-packed) structures. All cases show very similar features in the spatial dependence of the interaction, with no attenuation being observed in the amorphous structure. The structural dependence of the phase coherence of the electron wavefunctions is analysed. Effects due to alloying are briefly discussed.