Influence of Quasi-Bi-Stripe Charge Order on the Resistivity and Magnetism in a Bilayer Manganite La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$

Abstract

The charge ordering in the bilayer manganite system La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ with $0.30\le x\le 0.50$ has been studied by neutron diffraction. The charge order is characterized by the propagation vector parallel to the [1 0 0] direction (MnO${}_2$ direction), but the correlation length is short-ranged and extremely anisotropic, being $\sim 0.02a^{\ast }$ and $\sim 0.2a^{\ast }$ parallel and perpendicular to the modulation direction, respectively. The observed charge order can be viewed as a quasi-bi-stripe order, and accounts well for the $x$ dependence of the resistivity. The quasi-bistripe order is stable within the ferromagnetic (FM) MnO${}_2$ layers in the A-type antiferromagnetic order, but is instabilized by the 3 dimensional FM order.

11 pages, 5 figures

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