Charge and orbital-ordering-induced charge-polarized state in bilayer manganite

We have investigated a new type of electronic charge-polarized state in bilayer manganite, Pr(Sr0.1Ca0.9)(2)Mn2O7 (PSCMO). The PSCMO compound has two charge-orbital ordering (CO-OO) states with respect to the direction of the orbital stripe, which is clearly identified by addressing the optical anisotropy. Notably, a charge-polarized state is formed in the lower-temperature CO-OO state where the c-axis stacking patterns of the lattice and the charge modulations along the b-axis match with each other. We detail the correlation among the transport, the optical and the structural properties in the charge and orbital-ordering-induced charge-polarized states in bilayer manganite.