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Magnetic properties of defect-free and oxygen-deficient cubic SrCoO$_{3-δ}$

We investigated theoretically electronic and magnetic properties of the perovskite material SrCoO$_{3-δ}$ with $δ\leq 0.15$ using a projector-augmented plane-wave method and a Green's function method. This material is known from various experiments to be ferromagnetic with a Curie temperature of 260$\,$K to 305$\,$K and a magnetic moment of 1.5${\,μ_\text{B}}$ to 3.0${\,μ_\text{B}}$. Applying the magnetic force theorem as it is formulated within Green's function method, we calculated for SrCoO$_{3-δ}$ the magnetic exchange parameters and estimated the Curie temperature. Including correlation effects by an effective $U$ parameter within the GGA$+U$ approach and verifying this by hybrid functional calculations, we obtained the Curie temperatures in dependence of the oxygen deficiency close to the experimental values.