Electronic and magnetic states in doped LaCoO_3
  The electronic and magnetic states in doped perovskite cobaltites, (La, Sr)CoO_3, are studied in the numerically exact diagonalization method on Co_2O_{11} clusters. For realistic parameter values, it is shown that a high spin state and an intermediate spin state coexist in one-hole doped clusters due to strong p-d mixing. The magnetic states in the doped cobaltites obtained in the calculation explain various experimental results. 
K. Tsutsui(1), J. Inoue(1), and S. Maekawa(2) ((1)Dept. of Appl.   Phys., Nagoya Univ., (2)Inst. for Materials Res., Tohoku ...