On the Fermi surfaces of paramagnetic CucNi1-calloys

The authors have studied the Fermi surfaces of Cu c Ni 1-c alloys for c=87, 77, 62, 39 and 19 at.% within the atomic sphere approximation to the KKR-CPA scheme. They found that all these alloys had well defined Fermi surfaces with typical lifetimes tau approximately 10 13 s. In particular they have investigated the variation of the density of states at the Fermi energy and the shape of the Fermi surface with concentration. Moreover, they discuss the momentum distribution functions relevant to two-dimensional positron annihilation (ACAR) measurements. The results are rich in observable details and are consistent with experiments where these are available.