Thermodynamic properties of S=1 antiferromagnetic Heisenberg chains as Haldane systems.
Thermodynamic properties of S=1 antiferromagnetic Heisenberg chains as Haldane systems.
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作为 Haldane 系统的 S=1 反铁磁海森堡链的热力学性质。
DOI：
10.1103/physrevb.48.9528
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Miyashita
中科院分区：
文献类型：
--
作者：
Yamamoto;Miyashita
采用量子蒙特卡罗方法研究了具有自由边界和周期边界的S=1反铁磁海森堡链的热力学性质。特别是，比热，磁化率，和隐藏的序参量，这是固有的Halcohol相的温度依赖性进行了研究。比热在温度T peak = Δ 2Δ处有一个峰值，其中4是本模型的能隙，尽管比热的温度依赖性与肖特基型非常相似。在开链中，由于基态的四重简并性，磁化率表现出与链中自旋数目无关的类居里发散
Thermodynamic properties of S=1 antiferromagnetic Heisenberg chains with free and periodic boundaries are investigated by a quantum Monte Carlo method. In particular, temperature dependences of the specific heat, the magnetic susceptibility, and the hidden order parameter, which are inherent to the Haldane phase, are investigated. The specific heat turns out to have a peak at a temperature T peak ∼2Δ, where 4 is the energy gap of the present model, although the temperature dependence of the specific heat is very similar to the Schottky type. In open chains, due to the fourfold degeneracy of the ground state, the magnetic susceptibility shows a Curie-like divergence regardless of the number of spins in the chain