ポストペロブスカイトアナログ物質の探索および物性研究

抄録

Two post-perovskite oxides were discussed. One is CaPtO₃, which is a new analog to the isostructural MgSiO₃. By analyzing structural parameters, we elucidate the role of covalency in the post-perovskite compounds. The other is a new solid solution Ca_1-xNa_xIrO₃ (0 ≤ x ≤ 0.37). This system exhibits a filling-control metal-insulator transition on a quasi-two-dimensional lattice. These studies indicate that the post-perovskite structure is an excellent playground to search novel electronic phases of strongly correlated electrons.