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Using density functional theory we have performed theoretical investigationsof the electronic properties of a free-standing one-dimensional organometallicvanadium-benzene wire. This system represents the limiting case of multi-deckerV_n(C6H6)_{n+1} clusters which can be synthesized. We predict that the groundstate of the wire is a 100% spin-polarized ferromagnet (half-metal). Itsdensity of states is metallic at the Fermi energy for the minority electronsand shows a semiconductor gap for the majority electrons. We found that thehalf-metallic behavior is conserved up to 12%, longitudinal elongation of thewire. However, under further stretching, the system exhibits a transition to ahigh-spin ferromagnetic state that is accompanied by an abrupt jump of themagnetic moment and a gain of exchange energy.Comment: 4 pages, 5 color figures, submitted to Physical Review Letter

Organometallic Benzene-Vanadium Wire: A One-Dimensional Half-Metallic Ferromagnet