论文标题
Kagome和Square-Kagome晶格抗铁磁铁的磁化磁化熔化熔化
Melting of magnetization plateaus for kagome and square-kagome lattice antiferromagnets
论文作者
论文摘要
磁化曲线在零温度（例如高原或跳跃）处的非常规特征是沮丧的自旋系统的标志。关于它们在非零温度下的行为知之甚少。在这里，我们研究了Kagome晶格抗fiferromagnet的磁化曲线的温度依赖性，尤其是在饱和磁化的1/3处，对于高达n = 48个旋转的大晶格大小。我们讨论了不对称熔化的现象，并将其追溯到了在研究的高原的两侧以及整个高原状态的密度上的不平衡磁化步骤的综合效果。我们将我们的发现与在零场低温下相似的方形晶格进行了比较，但是在饱和磁化的1/3时，我们的表现方式有所不同。这两个系统都具有平坦的一块频带，因此与平板系统类别共享，在跳到饱和度之前的高原不对称地融化，但现在具有最小的敏感性，随着温度的升高，倾向于较低的场。
Unconventional features of the magnetization curve at zero temperature such as plateaus or jumps are a hallmark of frustrated spin systems. Very little is known about their behavior at non-zero temperatures. Here we investigate the temperature dependence of the magnetization curve of the kagome lattice antiferromagnet in particular at 1/3 of the saturation magnetization for large lattice sizes of up to N=48 spins. We discuss the phenomenon of asymmetric melting and trace it back to a combined effect of unbalanced magnetization steps on either side of the investigated plateau as well as on the behavior of the density of states across the plateau. We compare our findings to the square-kagome lattice that behaves similarly at low temperatures at zero field, but as we will demonstrate differently at 1/3 of the saturation magnetization. Both systems possess a flat one-magnon band and therefore share with the class of flat-band systems the general property that the plateau that precedes the jump to saturation melts asymmetrically but now with a minimal susceptibility that bends towards lower fields with increasing temperature.
