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The charge ordering in the bilayer manganite systemLa$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ with $0.30 \le x \le 0.50$ has beenstudied by neutron diffraction. The charge order is characterized by thepropagation vector parallel to the [1 0 0] direction (MnO$_2$ direction), butthe correlation length is short-ranged and extremely anisotropic, being $\sim0.02a^{*}$ and $\sim 0.2a^{*}$ parallel and perpendicular to the modulationdirection, respectively. The observed charge order can be viewed as aquasi-bi-stripe order, and accounts well for the $x$ dependence of theresistivity. The quasi-bistripe order is stable within the ferromagnetic (FM)MnO$_2$ layers in the A-type antiferromagnetic order, but is instabilized bythe 3 dimensional FM order.Comment: 11 pages, 5 figure

journal of the physical society of japan

Influence of Quasi-Bi-Stripe Charge Order on Resistivity and Magnetism in the Bilayer Manganite La2-2xSr1+2xMn2O7