Elastic constants, phase transition, and electronic structure of strontium oxide SrO: An ab initio Hartree-Fock study

Electronic structure of the homologous series of Ruddlesden–Popper phases SrO(SrTiO3) n , (n = 0–3, ∞)

The system SrO(SrTiO3) n contains promising compounds for several applications, whose functionalities all depend in particular on the band structure of the respective crystal. While the electronic structure of SrO and SrTiO3 is sufficiently clarified in literature, there is a lack of information concerning the Ruddlesden–Popper (RP) phases. In this work, density functional theory is used to compute the electronic structure for the homologous series with n = 0–3, ∞. The according band structures are presented and effective masses are given for the complete system. In addition, the calculations are consulted to discuss the thermodynamical stability of the RP phases, confirming the gain of formation energy up to n = 3, as reported in recent literature. A promising possibility for applications has been found, analyzing theses band structures: As the optical gaps at distinct high-symmetry points of the Brillouin zone show different dependencies on the lattice parameters, as it is reported for SrO in literature, a similar behavior could be expected in particular for the RP phase with n = 1.