Stripe order at low temperatures in La2-xSrxNiO4 with 0.289-x-0.5

The stripe order in La2-xSrxNiO4+delta with 0.289 less than or similar to x less than or similar to 0.5 was studied with neutron-scattering technique. At low temperatures, all samples exhibit hole stripe order. Incommensurabi lity epsilon of the stripe order is approximately linear in the hole concen tration n(h)=x+2 delta up to x=1/2, where delta denotes the off stoichiomet ry of oxygen atoms. The charge and spin ordering temperatures exhibit maxim a at n(h)=1/3, and both decrease beyond n(h)>1/3. For 1/3 less than or equa l to n(h)less than or similar to 1/2, the stripe ordering consists of the m ixture of the epsilon=1/3 stripe order and the n(h)=1/2 charge/spin order.