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Neutron diffraction studies have been carried out in the temperature(T) rangebetween 10 K and 130 K on a single crystal of YBaCo4O7, which has the stackingof kagome and triangular lattices of CoO4 tetrahedra along the c-axis.Structural transitions have been found at two temperatures Tc1~70 K and Tc2~105K. With decreasing T, magnetic order appears along with the transition at Tc2,but it does not grow to an ideal long-range order even at the lowest T studied(~10 K). Two groups of magnetic diffuse reflections, which originate from theCo-moments of the kagome and triangular lattices, are observed separately inthe reciprocal space. With further decreasing T, the growth rates of theintensities of these two are enhanced by another transition at Tc1. Thesemagnetic behaviors seem to be related to the release of the geometricalfrustration. At 10 K, the patterns of the magnetic short-range order have beendetermined for both sites of the kagome and triangular lattices.Comment: 6 pages, 10 figure

Magnetic Structure of YBaCo4O7with Kagome and Triangular Lattices

Magnetic Structure of YBaCo₄O₇with Kagome and Triangular Lattices