Valence changes associated with the metal-insulator transition in Bi${}_{1-x}$La${}_x$NiO${}_3$

H. Wadati, M. Takizawa, T. T. Tran +9

Perovskite-type BiNiO${}_3$ is an insulating antiferromagnet in which a charge disproportionation occurs at the Bi site. La substitution for Bi suppresses the charge disproportionati…