Implementation of the projector augmented-wave LDA+U method: Application to the electronic structure of NiO
Year: 2000
Type: article
Abstract: The so-called local-density approximation (LDA) plus the multiorbital mean-field Hubbard model (LDA+U) has been implemented within the all-electron projector augmented-wave method, and then used to compute the insulating antiferromagnetic ground state of NiO and its optical properties. The electronic and optical properties have been investigated as a function of the Coulomb repulsion parameter U. We find that the value obtained from constrained LDA $(U=8$ eV) is not the best possible choice, whereas an intermediate value $(U=5$ eV) reproduces the experimental magnetic moment and optical properties satisfactorily. At intermediate U, the nature of the band gap is a mixture of charge transfer and Mott-Hubbard type, and becomes almost purely of the charge-transfer type at higher values of U. This is due to the enhancement of the oxygen $2p$ states near the top of the valence states with increasing U value.
Authors: O. Bengone, M. Alouani, P. Blöchl, J. Hugel
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Ohio State University
OpenAlex ID: W2033274629