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Role of magnetic and structural symmetry breaking in forming the Mott insulating gap in Nb3⁢Cl8

Journal Article · · Physical Review. B
The α-phase of the gapped insulator Nb3Cl8 has recently emerged as the long-sought critical testing bed for examining the importance of strong interelectronic correlation vs symmetry breaking in understanding insulation of such Mott compounds. Structural symmetry breaking detected by density functional theory (DFT) energy lowering (such as dimer formation, disproportionation, or Jahn-Teller distortions) explains insulation in both d-electron Mott-like systems and in non-d-electron cases without recourse to strong correlation. Yet, in Nb3Cl8, structural symmetry breaking alone (viz. formation of Nb trimers) fails to explain insulation, leading instead to a partially occupied metallic flat band, in contrast with experimental observations. We examine the role of magnetic symmetry breaking, noting that Nb3Cl8 is an observed paramagnet (not an antiferromagnet), thus potentially carrying also short-range ordered magnetic moments. Describing the latter as a polymorphous distribution of nonzero local moments with total zero net magnetization is demonstrated to lower the DFT total energy, while gapping the system without recourse to strong correlation or long-range magnetic order. This suggests that degeneracy removal by symmetry breaking in mean-field-like approaches—either structural, or magnetic, or both—can reduce or eliminate the need for strong correlation, allowing the use of DFT for such Mott systems.
Research Organization:
Univ. of Colorado, Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Institute (RSEI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
SC0010467
OSTI ID:
2555843
Alternate ID(s):
OSTI ID: 2556928
OSTI ID: 3012045
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 15 Vol. 111; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (66)

Struktur und elektrochemische Untersuchung von Nb3Cl8 journal August 2001
Many-electron multiplet effects in the optical spectra of NiO, CoO and MnO journal October 1984
The “disordered local moment” picture of itinerant magnetism at finite temperatures journal November 1984
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Efficient stochastic generation of special quasirandom structures journal September 2013
Effect of static local distortions vs. dynamic motions on the stability and band gaps of cubic oxide and halide perovskites journal October 2021
Magnetic–Nonmagnetic Phase Transition with Interlayer Charge Disproportionation of Nb 3 Trimers in the Cluster Compound Nb 3 Cl 8 journal February 2017
Tunable Magnetic Transition to a Singlet Ground State in a 2D van der Waals Layered Trimerized Kagomé Magnet journal July 2019
Unconventional superconductivity in magic-angle graphene superlattices journal March 2018
Origin of band gaps in 3d perovskite oxides journal April 2019
Identifying the ground state structures of point defects in solids journal February 2023
Origin of superconductivity in hole doped SrBiO3 bismuth oxide perovskite from parameter-free first-principles simulations journal March 2023
Hidden magnetism and split off flat bands in the insulator metal transition in VO2 journal September 2024
Nb3Cl8: a prototypical layered Mott-Hubbard insulator journal January 2024
Exploration of new ferromagnetic, semiconducting and biocompatible Nb 3 X 8 (X = Cl, Br or I) monolayers with considerable visible and infrared light absorption journal January 2017
Rearrangement of van der Waals stacking and formation of a singlet state at T = 90 K in a cluster magnet journal January 2017
Hybrid functionals based on a screened Coulomb potential journal May 2003
Strongly Correlated Materials: Insights From Dynamical Mean-Field Theory journal March 2004
Influence of the exchange screening parameter on the performance of screened hybrid functionals journal December 2006
A consistent and accurate ab initio parametrization of density functional dispersion correction (DFT-D) for the 94 elements H-Pu journal April 2010
False metals, real insulators, and degenerate gapped metals journal December 2020
Short-range-order types in binary alloys: a reflection of coherent phase stability journal March 2000
How chemistry controls electron localization in 3d 1 perovskites: a Wannier-function study journal January 2005
Stability of polyatomic molecules in degenerate electronic states - I—Orbital degeneracy journal July 1937
Electron correlations in narrow energy bands journal November 1963
New Approach to the Theory of Superexchange Interactions journal July 1959
Direct Cation- -Cation Interactions in Several Oxides journal March 1960
Radiative Lifetimes of uv Multiplets in Boron, Carbon, and Nitrogen journal January 1966
Magnetic Effects and the Hartree-Fock Equation journal May 1951
DFT + DMFT calculations of the complex band and tunneling behavior for the transition metal monoxides MnO, FeO, CoO, and NiO journal July 2019
Symmetry-breaking polymorphous descriptions for correlated materials without interelectronic U journal July 2020
Understanding electronic peculiarities in tetragonal FeSe as local structural symmetry breaking journal December 2020
Mass enhancement in 3 d and s − p perovskites from symmetry breaking journal April 2021
Intrinsic local symmetry breaking in nominally cubic paraelectric BaTiO3 journal June 2022
Symmetry breaking forms split-off flat bands in quantum oxides controlling metal versus insulator phases journal January 2025
Exchange and correlation in atoms, molecules, and solids by the spin-density-functional formalism journal May 1976
Self-interaction correction to density-functional approximations for many-electron systems journal May 1981
Electronic properties of random alloys: Special quasirandom structures journal November 1990
Projector augmented-wave method journal December 1994
First-principles simulated-annealing study of phase transitions and short-range order in transition-metal and semiconductor alloys journal September 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Jahn-Teller distortion and magnetic structures in LaMnO 3 journal November 1997
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Mean-Value Point in the Brillouin Zone journal June 1973
Full orbital calculation scheme for materials with strongly correlated electrons journal March 2005
LDA + DMFT computation of the electronic spectrum of NiO journal November 2006
Special Points in the Brillouin Zone journal December 1973
Quantifying electronic correlation strength in a complex oxide: A combined DMFT and ARPES study of LaNiO 3 journal December 2015
Identifying multiexcitons inMoS2monolayers at room temperature journal April 2016
Twistronics: Manipulating the electronic properties of two-dimensional layered structures through their twist angle journal February 2017
Polymorphous band structure model of gapping in the antiferromagnetic and paramagnetic phases of the Mott insulators MnO, FeO, CoO, and NiO journal January 2018
Restoring the Density-Gradient Expansion for Exchange in Solids and Surfaces journal April 2008
Strongly Constrained and Appropriately Normed Semilocal Density Functional journal July 2015
New Technique for Investigating Noncrystalline Structures: Fourier Analysis of the Extended X-Ray—Absorption Fine Structure journal November 1971
Electric Field Breakdown of Charge-Density-Wave—Induced Anomalies in Nb Se 3 journal September 1976
Special quasirandom structures journal July 1990
Generalized Gradient Approximation Made Simple journal October 1996
Mott Transition and Suppression of Orbital Fluctuations in Orthorhombic 3 d 1 Perovskites journal April 2004
Correlated local dipoles in PbTe journal August 2018
Screening two-dimensional materials with topological flat bands journal August 2021
Rise and fall of Mott insulating gaps in YNiO3 paramagnets as a reflection of symmetry breaking and remaking journal April 2023
Origins versus fingerprints of the Jahn-Teller effect in d -electron A B X 3 perovskites journal November 2019
Discovery of a Single-Band Mott Insulator in a van der Waals Flat-Band Compound journal December 2023
The dynamics of charge-density waves journal October 1988
Metal-insulator transitions journal October 1998
Magnetic pair distribution function analysis of local magnetic correlations journal December 2013

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