Interplay between the trimerization and frustration in spin-12 distorted diamond type spin chain with the XXZ anisotropy
Interplay between the trimerization and frustration in spin-12 distorted diamond type spin chain with the XXZ anisotropy
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DOI：
10.1016/j.jmmm.2006.10.369
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发表时间：
2007-03
影响因子：
2.7
通讯作者：
K. Okamoto;A. Tokuno;T. Sakai
中科院分区：
文献类型：
--
作者：
K. Okamoto;A. Tokuno;T. Sakai
利用简并微扰理论和有限尺寸系统数值对角化数据的能级谱分析，研究了S=12的XXZ各向异性畸变金刚石型自旋链的基态相图.当XXZ各向异性Δ从0增大到∞时，当耦合参数取适当值时，出现重入量子相变TL-SF → Néel → TL-SF →亚铁磁.这里TL-SF表示Tomonaga-Luttinger自旋流体状态。进一步，我们发现四条Berezinskiii-Kosterlitz-无边界线在Δ-J3/J2平面上的相图中的一点相交。这些有趣的现象归因于三聚体性质、令人沮丧的相互作用和XXZ各向异性之间的相互作用。在具有这三个关键词的几个系统中可以发现类似的现象。
We investigate the ground state phase diagram of the S=12 distorted diamond type spin chain with the XXZ anisotropy by use of the degenerate perturbation theory and the level spectroscopy analysis of the numerical diagonalization data for the finite-size systems. As the XXZ anisotropy Δ is increased from 0 to ∞, there appears the reentrant quantum phase transition TL–SF ⇒ Néel ⇒ TL–SF ⇒ ferrimagnetic, when the coupling parameters have suitable values. Here TL–SF denotes the Tomonaga–Luttinger spin-fluid state. Further we find that four Berezinskii–Kosterlitz–Thouless lines meet together at one point in the phase diagram on the Δ versus J3/J2plane. These interesting phenomena are attributed to the interplay between the trimer nature, frustrating interactions and the XXZ anisotropy. Similar phenomena can be found in several systems having these three keywords.