Ferrimagnetism of the Heisenberg Models on the Quasi-One-Dimensional Kagome Strip Lattices
Ferrimagnetism of the Heisenberg Models on the Quasi-One-Dimensional Kagome Strip Lattices
复制标题
准一维戈薇带晶格上海森堡模型的亚铁磁性
DOI：
10.1143/jpsj.81.084710
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发表时间：
2012
影响因子：
1.7
通讯作者：
T. Shimokawa
中科院分区：
文献类型：
--
作者：
T. Fujiwara;K. Matsubayashi;Y. Uwatoko;T. Shigeoka;T. Shimokawa
利用精确对角化和密度矩阵重整化群方法，研究了拟一维kagome条形晶格上theS=1/2 Heisenberg模型的基态性质。两种不同条宽的模型内部具有相同的晶格结构，具有空间各向异性的二维kagome晶格。当不存在磁挫折时，两种模型都实现了众所周知的利布-马蒂斯铁磁态。另一方面，当磁受挫强度增加时，里布-马蒂斯型铁磁会崩塌。我们发现在利布-马蒂斯铁磁态和非磁性基态之间存在一个非利布-马蒂斯铁磁态。在非利布-马蒂斯铁磁状态下，局部磁化明显表现出与长距离周期性不相称的调制。这表明二维kagome晶格的中间相也是非lieb - mattis型铁磁态。
We study the ground-state properties of theS=1/2 Heisenberg models on the quasi-one-dimensional kagome strip lattices by the exact diagonalization and density matrix renormalization group methods. The models with two different strip widths share the same lattice structure in their inner part with the spatially anisotropic two-dimensional kagome lattice. When there is no magnetic frustration, the well-known Lieb–Mattis ferrimagnetic state is realized in both models. When the strength of magnetic frustration is increased, on the other hand, the Lieb–Mattis-type ferrimagnetism is collapsed. We find that there exists a non-Lieb–Mattis ferrimagnetic state between the Lieb–Mattis ferrimagnetic state and the nonmagnetic ground state. The local magnetization clearly shows an incommensurate modulation with long-distance periodicity in the non-Lieb–Mattis ferrimagnetic state. The intermediate non-Lieb–Mattis ferrimagnetic state occurs irrespective of strip width, which suggests that the intermediate phase of the two-dimensional kagome lattice is also the non-Lieb–Mattis-type ferrimagnetism.