Spin Nematic Phase in S=1 Triangular Antiferromagnets

Details Spin Nematic Phase in S=1 Triangular Antiferromagnets Spin Nematic Phase in S=1 Triangular Antiferromagnets

2005-12-09

arxiv.org/abs/cond-mat/0512209v1

J. Phys. Soc. Jpn., Vol.75, No.8, p.083701 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1143/JPSJ.75.083701

Spin 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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