Exchange enhancement of the Pauli spin susceptibility in highly disordered metals: Superconductivity of Pd

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Abstract
Using the exact one-electron ‘‘scattered states’’ in zeroth order with the external magnetic field as a perturbation, we apply Hartree-Fock perturbation theory to calculate self-consistently the exchange field. The Stoner factor scrS can be larger or smaller than in the ordered system, depending on the electronic band structure. For Pd, scrS is likely to be reduced and thus superconductivity can occur because the spin fluctuations are diminished without a large decrease in the density of states at the Fermi surface.

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