Magnetic Structure of YBaCo_4O_7 with Kagome and Triangular Lattices(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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Neutron diffraction studies have been carried out in the temperature (T) range between 10 and 130K on a single crystal of YBaCo_4O_7, which has the stacking of kagome and triangular lattices of CoO_4 tetrahedra along the c-axis. Structural transitions have been found at two temperatures T_<c1>〜70K and T_<c2>〜105K. With decreasing T, magnetic order appears along with the transition at T_<c2>, but it does not grow to an ideal long-range order even at the lowest T studied (〜10K). Two groups of magnetic reflections, which originate from the Co moments of the kagome and triangular lattices, are observed. With further decreasing T, the growth rates of the intensities of these two reflection groups are enhanced by another transition at T_<c1>. These magnetic behaviors seem to be related to the release of the geometrical frustration. At 10K, the patterns of the magnetic short-range order have been determined for both sites of the kagome and triangular lattices.
社団法人日本物理学会の論文
2006-05-15