The stripe order in La 2Ϫx Sr x NiO 4ϩ␦ with 0.289ՇxՇ0.5 was studied with neutron-scattering technique. At low temperatures, all samples exhibit hole stripe order. Incommensurability ⑀ of the stripe order is approximately linear in the hole concentration n h ϭxϩ2␦ up to xϭ1/2, where ␦ denotes the off stoichiometry of oxygen atoms. The charge and spin ordering temperatures exhibit maxima at n h ϭ
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