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Spin incommensurability has been recently experimentally discovered in thehole-doped Ni-oxide chain compound $\rm Y_{2-x}Ca_x Ba Ni O_5$ (G. Xu {\ital.}, Science {\bf 289}, 419 (2000)). Here a two orbital model for thismaterial is studied using computational techniques. Spin IC is observed in awide range of densities and couplings. The phenomenon originates inantiferromagnetic correlations ``across holes'' dynamically generated toimprove hole movement, as it occurs in the one-dimensional Hubbard model and inrecent studies of the two-dimensional extended t-J model. The close proximityof ferromagnetic and phase-separated states in parameter space are alsodiscussed.Comment: RevTex, 4 pages, 4 figures (eps

physical review. b, condensed matter

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Origin of spin incommensurability in hole-dopedS=1Y2−xCax