Consistent LDA'+DMFT approach to electronic structure of transition metal oxides: charge transfer insulators and correlated metals

Abstract

We discuss the recently proposed LDA'+DMFT approach providing consistent parameter free treatment of the so called double counting problem arising within the LDA+DMFT hybrid computational method for realistic strongly correlated materials. In this approach the local exchange-correlation portion of electron-electron interaction is excluded from self consistent LDA calculations for strongly correlated electronic shells, e.g. d-states of transition metal compounds. Then the corresponding double counting term in LDA+DMFT Hamiltonian is consistently set in the local Hartree (fully localized limit - FLL) form of the Hubbard model interaction term. We present the results of extensive LDA'+DMFT calculations of densities of states, spectral densities and optical conductivity for most typical representatives of two wide classes of strongly correlated systems in paramagnetic phase: charge transfer insulators (MnO, CoO and NiO) and strongly correlated metals (SrVO3 and Sr2RuO4). It is shown that for NiO and CoO systems LDA'+DMFT qualitatively improves the conventional LDA+DMFT results with FLL type of double counting, where CoO and NiO were obtained to be metals. We also include in our calculations transition metal 4s-states located near the Fermi level missed in previous LDA+DMFT studies of these monooxides. General agreement with optical and X-ray experiments is obtained. For strongly correlated metals LDA${}^{\prime }$+DMFT results agree well with earlier LDA+DMFT calculations and existing experiments. However, in general LDA'+DMFT results give better quantitative agreement with experimental data for band gap sizes and oxygen states positions, as compared to the conventional LDA+DMFT.

13 pages, 11 figures, 1 table. In v2 there some additional clarifications are included

References in corpus (6)

• Plane-wave based electronic structure calculations for correlated materials using dynamical mean-field theory and projected local orbitals
• NiO: Correlated Bandstructure of a Charge-Transfer Insulator
• Momentum-resolved spectral functions of SrVO${}_3$ calculated by LDA+DMFT
• Double Counting in LDA+DMFT - The Example of NiO
• Evidence for strong electronic correlations in the spectra of Sr${}_2$RuO${}_4$
• Consistent LDA'+DMFT -- an unambiguous way to avoid double counting problem: NiO test

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