スピン1/2三角格子反強磁性体Li<sub>2</sub><i>A</i>Mo<sub>3</sub>O<sub>8</sub>の非弾性中性子散乱

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タイトル別名
  • Triangular Lattice Antiferromagnet Li<sub></sub>2<i>A</i>Mo<sub>3</sub>O<sub>8</sub> by Inelastic Neutron Scattering
  • サイエンス記事 スピン1/2三角格子反強磁性体Li₂AMo₃O₈の非弾性中性子散乱
  • サイエンス キジ スピン 1/2サンカク ゴウシ ハン キョウジセイタイ Li ₂ AMo ₃ O ₈ ノ ヒダンセイ チュウセイシ サンラン

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<p>Li2AMo3O8 (A = In or Sc) is a molecular based spin-1/2 triangular lattice system where spin-1/2 Mo3O13 clusters in place of Mo ions form the uniform triangular lattice. Their ground states are different according to the A site. Li2InMo3O8 undergoes conventional 120° long-range magnetic order below TN = 12 K whereas isomorphic Li2ScMo3O8 exhibits no long-range magnetic order down to 0.5 K. Here, we report exotic magnetisms in Li2InMo3O8 and Li2ScMo3O8 investigated by inelastic neutron scattering (INS) using polycrystalline samples. Li2InMo3O8 and Li2ScMo3O8 show completely different INS spectra, representing their different ground states. Li2InMo3O8 exhibits spin wave excitation which is quantitatively described by the nearest neighbor anisotropic Heisenberg model based on the 120° spin structure. In contrast, Li2ScMo3O8 undergoes short-range magnetic order below 4 K with quantum-spin-liquid-like magnetic fluctuations down to the base temperature. Origin of the different ground states is discussed in terms of anisotropies of crystal structures and magnetic interactions.</p>

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  • 波紋

    波紋 30 (3), 136-139, 2020-08-10

    日本中性子科学会

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