Structural Phase Transitions of the Metal Oxide Perovskites SrTiO3, LaAlO3 and LaTiO3 Studied with a Screened Hybrid Functional

Abstract

We have investigated the structural phase transitions of the transition metal oxide perovskites SrTiO${}_3$, LaAlO${}_3$ and LaTiO${}_3$ using the screened hybrid density functional of Heyd, Scuseria and Ernzerhof (HSE06). We show that HSE06-computed lattice parameters, octahedral tilts and rotations, as well as electronic properties, are significantly improved over semilocal functionals. We predict the crystal field splitting (${\Delta }_{CF}$) resulting from the structural phase transition in SrTiO${}_3$ and LaAlO${}_3$ to be 3 meV and 10 meV, respectively, in excellent agreement with experimental results. HSE06 identifies correctly LaTiO${}_3$ in the magnetic sates as a Mott insulator. Also, it predicts that the GdFeO${}_3$-type distortion in non-magnetic LaTiO${}_3$ will induce a large ${\Delta }_{CF}$ of 410 meV. This large crystal-field splitting associated with the large magnetic moment found in the G-type antiferromagnetic state suggest that LaTiO${}_3$ has an induced orbital order, which is confirmed by the visualisation of the highest occupied orbitals. These results strongly indicate that HSE06 is capable of efficiently and accurately modeling perovskite oxides, and promises to efficiently capture the physics at their heterointerfaces.

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Cited by in corpus (13)

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• Electron degeneracy and intrinsic magnetic properties of epitaxial Nb:SrTiO${}_3$ thin-films controlled by defects
• Neutral defects in SrTiO3 studied with screened hybrid density functional theory
• Nanoscopic time crystal obtained by nonergodic spin dynamics
• BinPo: An open-source code to compute the band structure of two-dimensional electron systems
• The role of screened exact exchange in accurately describing properties of transition metal oxides: Modeling defects in LaAlO3
• Self-consistent DFT+$U$+$V$ study of oxygen vacancies in SrTiO${}_3$
• Nature of Structural Changes Near the Magnetic Ordering Temperature in Small-Ion Rare Earth Perovskites RMnO3
• Multiferroic interfaces composed of d0 perovskites oxides
• Ultrafast metal-to-insulator switching in a strongly correlated system