Electronic Band Structure of $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$

We present theoretical studies of electric and magnetic properties in manganese perovskite $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$. The calculations were carried out by means of the first-principles density functional theory (DFT) with general gradient approximation GGA+U using Wien2K package. The P-3c1 crystal structure was chosen from the detailed X-ray diffraction data for the perovskite. For Mn and Fe d electrons exact exchange energy was utilized. Different orientation of magnetic moments on Mn and Fe atoms was considered. The computed density of states display band gap for both spin orientations in accord with our previous work, indicating that this compound should show an insulating ground state