Influence of anti-ferromagnetic ordering and electron correlation on the electronic structure of MnTiO${}_3$

Abstract

Electron correlation and long-range magnetic ordering have a significant impact on the electronic structure and physical properties of solids. Here, we investigate the electronic structure of ilmenite MnTiO${}_3$ using room temperature photoemission spectroscopy and theoretical approaches within density functional theory (DFT), DFT+$U$ and DFT+dynamical mean field theory (DMFT). Mn 2$p$ (Ti 2$p$) core level photoemission spectra, confirming Mn${}^{2+}$ (Ti${}^{4+}$) oxidation state, exhibit multiple satellites which are very similar to that of MnO (TiO${}_2$), suggesting similar strength of various interactions in this system. Valence band spectra collected at different photon energies suggest dominant Mn 3$d$ character in the highest occupied band with a wide insulating gap. DFT(+$U$) correctly predicts the experimentally observed anti-ferromagnetic (AFM) insulating ground state for MnTiO${}_3$ where the requirement of a large $U$ to reproduce the experimental values of magnetic moment and band gap signifies the importance of electron correlation. Magnetically disordered paramagnetic (PM) phase could be well captured within DFT+DMFT, which provides an excellent agreement for the experimental band gap, paramagnetic moment, valence band spectra as well as dominant Mn 3$d$ character in the highest occupied band. The calculated spectral function remains largely unaffected and exhibits sharper features in the magnetically ordered AFM phase. We show that the electronic structure of MnTiO${}_3$ in both the PM and AFM phases can be accurately described within DFT+DMFT.

References in corpus (13)

• Antiferromagnetic spintronics
• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Hubbard-corrected DFT energy functionals: the LDA+U description of correlated systems
• Dynamical Mean-Field Theory within the Full-Potential Methods: Electronic structure of Ce-115 materials
• Systematic beyond-DFT study of binary transition metal oxides
• Equation of state of paramagnetic CrN from ab initio molecular dynamics
• Charge-transfer effect in hard x-ray 1$s$ and 2$p$ photoemission spectra: LDA+DMFT and cluster-model analysis
• Influence of magnetic ordering on the spectral properties of binary transition metal oxides
• Evidence of spin lattice coupling in MnTiO${}_3$: an x-ray diffraction study
• Correlation strength, orbital-selective incoherence, and local moments formation in the magnetic MAX-phase Mn${}_2$GaC
• The role of magnetoelastic coupling and magnetic anisotropy in MnTiO${}_3$
• Satellites in the Ti~1$s$ core level spectra of SrTiO${}_3$ and TiO${}_2$
• Direct evidence of the existence of Mn3+ ions in MnTiO3