Spin Nematic Phase in S =1 Triangular Antiferromagnets
2006; Physical Society of Japan; Volume: 75; Issue: 8 Linguagem: Inglês
10.1143/jpsj.75.083701
ISSN1347-4073
AutoresHirokazu Tsunetsugu, Mitsuhiro Arikawa,
Tópico(s)Organic and Molecular Conductors Research
ResumoSpin nematic order is investigated for a S=1 spin model on triangular lattice with bilinear-biquadratic interactions. We particularly studied an antiferro nematic order phase with three-sublattice structure, and magnetic properties are calculated at zero temperature by means of bosonization. Two types of bosonic excitations are found. One is a gapless excitation with linear energy dispersion around $k \sim 0$, and this leads to a finite spin susceptibility at T=0 and would have a specific heat $C(T) \sim T^2$ at low temperatures. These behaviors can explain many of characteristic features of recently discovered spin liquid state in the triangular magnet, NiGa2S4.
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