Triangular Lattice Antiferromagnet Li2AMo3O8 by Inelastic Neutron Scattering

Iida Kazuki

doi:10.5611/hamon.30.3_136

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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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Abstract

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 T_N = 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.

Journal

hamon

hamon 30 (3), 136-139, 2020-08-10

The Japanese Society for Neutron Science

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Triangular Lattice Antiferromagnet Li<sub></sub>2<i>A</i>Mo<sub>3</sub>O<sub>8</sub> by Inelastic Neutron Scattering