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We have studied the frustrated system YBaCo4O7 generally described as analternating stacking of Kagome and triangular layers of magnetic ions on atrigonal lattice, by single crystal neutron diffraction experiments above theNeel ordering transition. Experimental data reveals pronounced magnetic diffusescattering, which is successfully modeled by direct Monte-Carlo simulations.Long-range magnetic correlations are found along the c-axis, due to thepresence of corner-sharing bipyramids, creating quasi one-dimensional order atfinite temperature. In contrast, in the Kagome layers ab-plane, the spin-spincorrelation function -displaying a short-range 120 degrees configuration-decays rapidly as typically found in spin-liquids. YBaCo4O7 experimentallyrealizes a new class of two-dimensional frustrated systems where the strongout-of-plane coupling does not lift the in-plane degeneracy, but instead act asan external "field".

Magnetic correlations in YBaCo4O7 probed by single-crystal neutron scattering