Origin of Spin Incommensurability in Hole-doped S=1 ${\mathrm{Y}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{a}}_{\mathrm{x}}\mathrm{BaNi}{\mathrm{O}}_5$ Chains

Abstract

Spin incommensurability has been recently experimentally discovered in the hole-doped Ni-oxide chain compound ${\mathrm{Y}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{a}}_{\mathrm{x}}\mathrm{BaNi}{\mathrm{O}}_5$ (G. Xu {\it al.}, Science {\bf 289}, 419 (2000)). Here a two orbital model for this material is studied using computational techniques. Spin IC is observed in a wide range of densities and couplings. The phenomenon originates in antiferromagnetic correlations ``across holes'' dynamically generated to improve hole movement, as it occurs in the one-dimensional Hubbard model and in recent studies of the two-dimensional extended t-J model. The close proximity of ferromagnetic and phase-separated states in parameter space are also discussed.

RevTex, 4 pages, 4 figures (eps)

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Cited by in corpus (3)

• Orbital ordering phenomena in $d$- and $f$-electron systems
• Interference Effects in the Conductance of Multi-Level Quantum Dots
• Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates