Implementation of the Projector Augmented Wave LDA+U Method: Application to the Electronic Structure of NiO

Details Implementation of the Projector Augmented Wave LDA+U Method: Application to the Electronic Structure of NiO Implementation of the Projector Augmented Wave LDA+U Method: Application to the Electronic Structure of NiO

2000-03-10

arxiv.org/abs/cond-mat/0003182v1

Physics

Condensed Matter

Strongly Correlated Electrons

23 pages, 6 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.16392

The so-called local density approximation plus the multi-orbital mean-field Hubbard model (LDA+U) has been implemented within the all-electron projector augmented-wave method (PAW), 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.

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