Abstract
The authors develop two alternative reciprocal space methods applicable to the calculation of the spin susceptibility of transition metals. The first, a complex energy method, uses the tau matrices of scattering theory, while the second is based on the one-particle energy eigenvalues and the wavefunction coefficients. They demonstrate that both methods may be used to evaluate the non-interacting susceptibility by performing Brillouin zone integrations. As a second step the interacting quantities may be obtained using the methods described in previous work. Their applications to Pd yield a remarkable similarity between results gained in these different ways.