Analytic expression for the appearance of the Slater mode in ferroelectric perovskites

An analytic expression for the appearance of the Slater mode in ferroelectric perovskites has been proposed through the application of a configuration-interaction problem discussed by Zaanen and Sawatzky. In ferroelectric perovskite oxides ABO3, the appearance of the Slater mode is found to be closely related to the p–d hybridization between B and O as well as the p–d energy gap and on-site Coulomb energy in the B d state. Numerical estimations using the proposed expression are consistent with the experimental results of ATiO3 (A=Ca, Sr, Ba and Pb).