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Energy Bands in Ferromagnetic Nickel
Phys. Rev. 159, 415 – Published 10 July, 1967
DOI: https://doi.org/10.1103/PhysRev.159.415
Abstract
The energy bands in ferromagnetic nickel have been calculated within the framework of the unrestricted Hartree-Fock scheme, in which the exchange terms were approximated by a local potential. The augmented-plane-wave method was used to find the eigenvalues of the approximate Hamiltonian, and self-consistency was achieved after several iterations of this method. It was found that the use of the averaged free-electron exchange potential, i.e., , gave results in qualitative disagreement with experiment. Reducing the exchange potential by a factor of gave more realistic results. Comparisons with the experimental data are presented which show that the unrestricted Hartree-Fock scheme may be an acceptable model for the ground state of a ferromagnetic solid.
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