Nuclear spin lattice relaxation rates of Ag in AgPd and Cu in CuPd

Abstract

The results of earlier charge self-consistent KKR CPA calculations on AgPd and CuPd have been used to calculate the nuclear spin lattice relaxation rate (T₁T)^-1 of Ag and Cu in these alloys. For Ag in AgPd the contact contribution to (T₁T)^-1 is found to be dominant for the whole range of concentrations and is primarily responsible for the concentration dependence of (T₁T)^-1. It was necessary to use the relativistic expression for the contact hyperfine field to bring the numerical results into close agreement with experiment. For Cu in CuPd the contact contribution is also dominant on the Cu-rich side. On the Pd-rich side, on the other hand, this part of (T₁T)^-1 is exceeded by the d-dipolar and orbital contributions. In spite of the wide spread in experimental data for CuPd, it can be concluded that CuPd does not behave like a rigid band. Thus is in full agreement with calculations.