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Title: Origin of band gaps in 3d perovskite oxides

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [3]
  1. Univ. Paris-Saclay, Palaiseau (France). Mixed Unit Of Physics CNRS/Thales; University of Colorado
  2. Univ. Paris-Saclay, Palaiseau (France). Mixed Unit Of Physics CNRS/Thales
  3. Univ. of Colorado, Boulder, CO (United States)

With their broad range of properties, ABO3 transition metal perovskite oxides have long served as a platform for device applications and as a testing bed for different condensed matter theories. Their insulating character and structural distortions are often ascribed to dynamical electronic correlations within a universal, symmetry-conserving paradigm. This view restricts predictive theory to complex computational schemes, going beyond density functional theory (DFT). Here, we show that, if one allows symmetry-breaking energy-lowering crystal symmetry reductions and electronic instabilities within DFT, one successfully and systematically recovers the trends in the observed band gaps, magnetic moments, type of magnetic and crystallographic ground state, bond disproportionation and ligand hole effects, Mott vs. charge transfer insulator behaviors, and the amplitude of structural deformation modes including Jahn-Teller in low temperature spin-ordered and high temperature disordered paramagnetic phases. We then provide a classification of the four mechanisms of gap formation and establish DFT as a reliable base platform to study the ground state properties in complex oxides.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0010467; SC0010467
OSTI ID:
1594114
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition journal August 2019
Density Functional Theory Studies of the Metal–Insulator Transition in Vanadium Dioxide Alloys journal August 2019
Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition journal August 2019
Mott gapping in 3 d A B O 3 perovskites without Mott-Hubbard interelectronic repulsion energy U journal July 2019
Electronic structure of rare-earth infinite-layer R Ni O 2 ( R = La , Nd ) journal November 2019
Identification of ferrimagnetic orbitals preventing spinel degradation by charge ordering in Li x Mn 2 O 4 journal November 2019
Electronic and magnetic properties of perovskite selenite and tellurite compounds: CoSeO 3 ,   NiSeO 3 ,   CoTeO 3 , and NiTeO 3 journal January 2020
Mechanism and control parameters of the coupled structural and metal-insulator transition in nickelates journal June 2019
Design of Heteroanionic MoON Exhibiting a Peierls Metal-Insulator Transition journal December 2019
Electronic structure of metallic and insulating phases of vanadium dioxide and its oxide alloys journal September 2019
Origins versus fingerprints of the Jahn-Teller effect in d -electron A B X 3 perovskites journal November 2019
Electronic structure of metallic and insulating phases of vanadium dioxide and its oxide alloys journalarticle January 2019

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