Ground-State Phases of Anisotropic Mixed Diamond Chains with Spins 1 and 1/2
Ground-State Phases of Anisotropic Mixed Diamond Chains with Spins 1 and 1/2
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DOI：
10.7566/jpsj.83.114711
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发表时间：
2014-08
影响因子：
1.7
通讯作者：
K. Hida
中科院分区：
文献类型：
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作者：
K. Hida
研究了自旋为1和1/2的各向异性混合金刚石链的基态相。单网站和交换各向异性被认为是。我们发现的阶段组成的一个阵列的不相关的自旋1集群分离的单重态二聚体。除了在最简单的情况下，集团由一个单一的S = 1的自旋，这种类型的基态打破平移对称自发。虽然导致这种类型的基态的机制是相同的，在各向同性的情况下，它是顺磁性或顺磁性取决于两种类型的各向异性之间的竞争。我们还发现了尼尔，周期加倍尼尔，Halfenic，和大D阶段，基态是一个单一的自旋集群的无限大的大小相当于自旋1海森堡链交替各向异性。通过数值分析确定了典型参数的基态相图。在各种极限情况下，基态相图解析确定。这个...
The ground-state phases of anisotropic mixed diamond chains with spins 1 and 1/2 are investigated. Both single-site and exchange anisotropies are considered. We find the phases consisting of an array of uncorrelated spin-1 clusters separated by singlet dimers. Except in the simplest case where the cluster consists of a single S = 1 spin, this type of ground state breaks the translational symmetry spontaneously. Although the mechanism leading to this type of ground state is the same as that in the isotropic case, it is nonmagnetic or paramagnetic depending on the competition between two types of anisotropy. We also find the Neel, period-doubled Neel, Haldane, and large-D phases, where the ground state is a single spin cluster of infinite size equivalent to the spin-1 Heisenberg chain with alternating anisotropies. The ground-state phase diagrams are determined for typical sets of parameters by numerical analysis. In various limiting cases, the ground-state phase diagrams are determined analytically. The lo...