Magnetic Structure of YBaCo<sub>4</sub>O<sub>7</sub>with Kagome and Triangular Lattices

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  • Soda Minoru
    Department of Physics, Division of Material Science, Nagoya University
  • Yasui Yukio
    Department of Physics, Division of Material Science, Nagoya University
  • Moyoshi Taketo
    Department of Physics, Division of Material Science, Nagoya University
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University
  • Igawa Naoki
    Quantum Beam Science Directorate, Japan Atomic Energy Agency
  • Kakurai Kazuhisa
    Quantum Beam Science Directorate, Japan Atomic Energy Agency

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  • Magnetic Structure of YBaCo4O7 with Kagome and Triangular Lattices

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Neutron diffraction studies have been carried out in the temperature (T) range between 10 and 130 K on a single crystal of YBaCo4O7, which has the stacking of kagome and triangular lattices of CoO4 tetrahedra along the c-axis. Structural transitions have been found at two temperatures Tc1∼70 K and Tc2∼105 K. 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 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 Tc1. These magnetic behaviors seem to be related to the release of the geometrical frustration. At 10 K, the patterns of the magnetic short-range order have been determined for both sites of the kagome and triangular lattices.

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