IMAGING FERMI SURFACE THROUGH DIFFUSE SCATTERING FROM CONCENTRATED DISORDERED ALLOYS

We show qualitatively how the Fermi surface of a disordered alloy will be reflected in the local-order diffuse scattering of x rays, etc., through anomalies similar to those predicted by Kohn for phonon scattering. These ideas are then applied to the existing data on the splitting of the diffuse spots from Cu-Au alloys above Tc and, more tentatively, to the <111> scattering profile from -CuZn. The results indicate that disordered Cu3Au has a Fermi surface much like copper's while disordered CuAu3 resembles gold. © 1969 The American Physical Society.