Spin Nematic Phase in S=1 Triangular Antiferromagnets(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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Spin nematic order is investigated for an S=1 spin model on a triangular lattice with bilinear-biquadratic interactions. We particularly studied an antiferro nematic order phase with a three-sublattice structure, and magnetic properties are calculated at zero temperature by bosonization. Two types of bosonic excitations are found and we calculated dynamic and static spin correlations. One is a gapless excitation with linear energy dispersion around k〜0, and this leads to a finite spin susceptibility at T=0 and would have a specific heat C(T)〜T^2 at low temperatures. These behaviors can explain many of the characteristic features of a recently discovered spin liquid state in the triangular magnet, NiGa_2S_4.
社団法人日本物理学会の論文
2006-08-15