Transition-metal dioxides: A case for the intersite term in Hubbard-model functionals
Year: 2011
Type: article
Abstract: Triatomic transition-metal oxides in the "inserted dioxide" (O-M-O) structure represent one of the simplest examples of systems that undergo qualitative geometrical changes via subtle electronic-structure modulation. We consider here three transition-metal dioxide molecules (MO(2) where M = Mn, Fe, or Co), for which the equilibrium structural (e.g., bent or linear geometry) and electronic (e.g., spin or symmetry) properties have been challenging to assign both theoretically and experimentally. Augmenting a standard density-functional theory (DFT) approach with a Hubbard term (DFT+U) occasionally overlocalizes the 3d manifold, leading to an incorrect bond elongation and, in turn, poor equilibrium geometries for MO(2) molecules, while preserving good spin-state splittings. Proper description of both geometry and energetics for these molecules is recovered; however, through either calculating DFT+U relaxations at fixed M-O bond lengths or by inclusion of an intersite interaction term V that favors M(3d)-O(2p) interactions. In this latter case, both U and V are calculated fully from first-principles and are not fitting parameters. Finally, we identify an approach that more accurately determines the Hubbard U over a coordinate in which the covalent character of bonding varies.
Source: The Journal of Chemical Physics
DOI: 10.1063/1.3559452
Authors: Heather J. Kulik, Nicola Marzari
Institutions: Stanford University, University of Oxford
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2085078643