Stripe-type charge ordering in the metallicA-type antiferromagnetPr0.5Sr0.5MnO3

We demonstrate that an A-type antiferromagnetic (AFM) state of ${\mathrm{Pr}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_3$ exhibits a charge ordering that governs the transport property. This charge ordering is stripelike, being characterized by a wave vector $\mathit{q}\sim \mathrm{}(0,0,0.3)\mathrm{}$ with very anisotropic correlation parallel and perpendicular to the stripe direction. This charge ordering is specific to the manganites with relatively wide one-electron bandwidth W which often exhibit a metallic A-type AFM state, and should be strictly distinguished from the CE-type checkerboardlike charge ordering commonly observed in manganites with narrower W, such as ${\mathrm{La}}_{1-x}{\mathrm{Ca}}_x{\mathrm{MnO}}_3$ and ${\mathrm{Pr}}_{1-x}{\mathrm{Ca}}_x{\mathrm{MnO}}_3.$