Functional renormalization group for the anisotropic triangular antiferromagnet
Functional renormalization group for the anisotropic triangular antiferromagnet
复制标题
各向异性三角形反铁磁体的函数重正化群
DOI：
10.1103/physrevb.83.024402
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发表时间：
2011
影响因子：
3.7
通讯作者：
R. Thomale
中科院分区：
文献类型：
--
作者：
J. Reuther;R. Thomale
我们提出了一个泛函重整化群方案，它允许我们从第一性原理出发计算格点以外任意晶格几何的受阻磁系统。我们研究了空间各向异性三角形晶格上反铁磁(AFM)自旋-海森堡模型基态的磁化率，其中记录了沿晶格方向的链内键的耦合强度和链间键的耦合强度。我们确定了海森堡模型的三个不同阶段。在有效正方形晶格的基础上，我们发现了原子力显微镜的Néel级到螺旋级的跃迁，表明它是二级的。此外，在各向同性点上方，我们发现了一级转变为具有共线AFM条纹涨落的磁性无序相。
We present a functional renormalization group scheme that allows us to calculate frustrated magnetic systems of arbitrary lattice geometry beyondsites from first principles. We study the magnetic susceptibility of the antiferromagnetic (AFM) spin-Heisenberg model ground state on the spatially anisotropic triangular lattice, wheredenotes the coupling strength of the intrachain bonds along one lattice direction andthe coupling strength of the interchain bonds. We identify three distinct phases of the Heisenberg model. Increasingfrom the effective square lattice, we find an AFM Néel order to spiral order transition at, with an indication that it is of second order. In addition, above the isotropic point at, we find a first-order transition to a magnetically disordered phase with collinear AFM stripe fluctuations.