Successive Phase Transitions of LuBaCo<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
  • Moyoshi Taketo
    Department of Physics, Division of Material Science, Nagoya University
  • Yasui Yukio
    Department of Physics, Division of Material Science, Nagoya University
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University
  • Kakurai Kazuhisa
    Quantum Beam Science Directorate, Japan Atomic Energy Agency

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  • Successive phase transitions of LuBaCo4O7 with kagome and triangular lattices

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Abstract

Magnetic, thermal and neutron diffraction measurements have been carried out on single-crystal samples of LuBaCo4O7 with kagome and triangular lattices of Co spins. Anomalies of the magnetic susceptibility have been found at temperatures Ta1∼70 K and Ta2∼50 K. We have also found a second-order structural transition at Tc1∼165 K and a first-order structural transition at Tc2∼105 K (Tc2′∼80 K) with increasing (decreasing) temperature. Two groups of magnetic diffuse scattering, corresponding to the short-range correlations with the commensurate (C) and incommensurate (IC) periods, have been found to exist below the structural transition temperature Tc2 (Tc2′). The reflections with the C and IC periods originate from the moments on the kagome and triangular lattices, respectively. At 10 K, the magnetic correlation length is estimated to be ∼100 Å. The structural changes of LuBaCo4O7 and YBaCo4O7 differ significantly, which seems to induce the differences in their magnetic properties.

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