Ferromagnetism of metallic compounds with the perovskite structure

On the basis of the concept of strong interaction in one unit cell, it is stated that ferromagnetic instability can occur in a system with hops between oxygen anions and transition metal (Me) cations in A_1−x B_xMeO₃ compounds. A phase diagram is constructed to describe the occurrence of ferromagnetic ordering as a function of the average number of holes (h _{t, d}) and (h _p) in the low-spin or high-spin t _2g ⁶ or high-spin 3d ¹⁰ shell of the transition metal and in the 2p ⁶ shells of O²⁻.