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arXiv 1004.4983cond-mat.stat-mech
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3D Ising普适类中的普适振幅比

Universal amplitude ratios in the 3D Ising Universality Class

Martin Hasenbusch

摘要:

我们计算了一些普遍的振幅比在三维伊辛普适性类。为此,我们在简单立方晶格上对改进的Blume-Capel模型进行了蒙特卡罗模拟。例如,我们得到A_+/A_-=0.536(2)和C_+/C_-=4.713(7),其中A_+-和C_+-分别是比热和磁化率的振幅。下标+和-分别表示高温和低温阶段。我们比较我们的结果与以前的蒙特卡罗模拟,高,低温系列展开,场论方法和实验。

英文摘要:

We compute a number of universal amplitude ratios in the three-dimensional Ising universality class. To this end, we perform Monte Carlo simulations of the improved Blume-Capel model on the simple cubic lattice. For example, we obtain A_+/A_-=0.536(2) and C_+/C_-=4.713(7), where A_+- and C_+- are the amplitudes of the specific heat and the magnetic susceptibility, respectively. The subscripts + and - indicate the high and the low temperature phase, respectively. We compare our results with those obtained from previous Monte Carlo simulations, high and low temperature series expansions, field theoretic methods and experiments.

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