论文标题
了解$ s = 1 $ antiferromagnet ba $ _2 $ fesi $ _2 $ o $ $ _7 $中的温度依赖性su（$ 3 $）旋转动力学
Understanding temperature-dependent SU($3$) spin dynamics in the $S=1$ antiferromagnet Ba$_2$FeSi$_2$O$_7$
论文作者
论文摘要
量子磁铁承认，预计将通过基于SU（$ n $）相干状态的经典近似来描述一个以上的经典限制和具有强型单离子各向异性的$ n $级别系统。在这里，我们通过对有效旋转的抗fiferromagnet \ bfso {}进行有限温度非弹性中子散射（INS）数据来检验这一假设。测得的动态结构因子是用SU（$ 3 $）旋转的广义Landau-Lifshitz动力学计算的。与基于SU（$ 2 $）相干状态的传统经典限制不同，经典SU（$ 3 $）旋转获得的结果与测量的温度依赖性光谱非常吻合。此处开发的SU（$ 3 $）方法提供了一个通用框架，可以理解包括弱耦合的抗铁磁二聚体，三聚体或四聚体以及具有强型单离子各向异性的磁铁。
Quantum magnets admit more than one classical limit and $N$-level systems with strong single-ion anisotropy are expected to be described by a classical approximation based on SU($N$) coherent states. Here we test this hypothesis by modeling finite temperature inelastic neutron scattering (INS) data of the effective spin-one antiferromagnet \bfso{}. The measured dynamic structure factor is calculated with a generalized Landau-Lifshitz dynamics for SU($3$) spins. Unlike the traditional classical limit based on SU($2$) coherent states, the results obtained with classical SU($3$) spins are in good agreement with the measured temperature-dependent spectrum. The SU($3$) approach developed here provides a general framework to understand the broad class of materials comprising weakly coupled antiferromagnetic dimers, trimers, or tetramers, and magnets with strong single-ion anisotropy.
