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Abstract
Spin–orbit coupling has been reported to be responsible for the insulating nature of the 5d 1 osmate double perovskite Ba 2NaOsO 6 (BNOO). However, whether spin–orbit coupling indeed drives the metal-to-insulator transition (MIT) in this compound is an open question. In this work we investigate the impact of relativistic effects on the electronic properties of BNOO via density functional theory plus dynamical mean-field theory calculations in the paramagnetic regime, where the insulating phase is experimentally observed. The correlated subspace is modeled with spinor projectors of the projector augmented wave method (PAW) employed in the Vienna Ab Initio Simulation Package (VASP), suitably interfaced with the TRIQS package. The inclusion of PAW spinor projectors in TRIQS enables the treatment of spin–orbit coupling effects fully ab-initio within the dynamical mean-field theory framework. In the present work, we show that spin–orbit coupling, although assisting the MIT in BNOO, is not the main driving force for its gapped spectra, placing this material in the Mott insulator regime. Relativistic effects primarily impact the correlated states’ character, excitations, and magnetic ground-state properties.
Original language | English |
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Article number | 112764 |
Number of pages | 6 |
Journal | Computational Materials Science |
Volume | 233 |
Early online date | 29 Mar 2023 |
DOIs | |
Publication status | Published - 30 Jan 2024 |
Austrian Fields of Science 2012
- 103009 Solid state physics
Keywords
- cond-mat.str-el
- cond-mat.mtrl-sci
- Double perovskite
- DFT+DMFT
- Strong spin–orbit coupling
- Dynamical mean field theory
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Exchange Interactions in multi-correlated Spin-Orbit Systems
1/12/22 → 30/11/25
Project: Research funding