论文标题
砷酸盐Cu4O（ASO4）2和同种磷酸盐Cu4O（PO4）2的矫正和三斜变化（PO4）2：非常沮丧
Orthorhombic and triclinic modifications of the arsenate Cu4O(AsO4)2 and isotypic phosphates Cu4O(PO4)2: strongly frustrated antiferromagnetics
论文作者
论文摘要
构建和分析了砷酸砷酸酯Cu4O（ASO4）2和同种磷酸盐Cu4O（ASO4）2和同种磷酸盐2的结构磁模型（ASO4）2。它们的基本元素是由抗磁性Cu4四面体组成的复杂丝带。从结构上讲，这些四面体没有共享的铜原子。但是，在复杂的丝带和它们之间，它们之间都有强大的抗铁磁（AFM）和铁磁（FM）耦合。已经确定，由于沿Cu4四面体的边缘最近的AFM相互作用之间的竞争以及相互作用与多种远程二级AFM和FM相互作用之间的竞争，这两种修饰都是强烈挫败的3D抗磁力。此外，大量较弱的远程互动彼此之间正在竞争。但是，由于三种磁离子Cu1和Cu3中的两种类型的Cu1和Cu3中的两种，有可能在中心对称原晶修饰（PNMA）中订购Dzyaloshinskii-moriya（DM）相互作用，因为在部分位置4C处于逆转位置中心中的部分位置4C。在Cu4O（AS（p）O4）2的三会面修饰（P -1）中，所有四个铜离子均位于中心对称等效位置2i中，可防止DM相互作用。该中心对称性将允许在Cu4O（AS（P）O4）2的三斜变化中进行磁相互作用，但仍会在较低温度下感到沮丧。这些化合物的三会面修饰可能是量子自旋液体。
A structural-magnetic models of the orthorhombic and triclinic modifications of the arsenates Cu4O(AsO4)2 and isotypic phosphates Cu4O(PO4)2 has been built and analyzed. Their base elements are the complicated ribbons composed of antiferromagnetic Cu4 tetrahedra. Structurally, these tetrahedra have no shared copper atoms; however, there are strong antiferromagnetic (AFM) and ferromagnetic (FM) couplings between them, both within the complicated ribbons and between them. It has been established that both modifications are strongly frustrated 3-D antiferromagnetics due to competition between the nearest AFM interactions along the edges of the Cu4 tetrahedra and competition between interactions and a multiplicity of long-range secondary AFM and FM interactions. Additionally, a large number of weaker long-range interactions are competing among each other. However, there is a possibility of the ordering Dzyaloshinskii-Moriya (DM) interaction in the centrosymmetric orthorhombic modification (Pnma), because two of the three types of magnetic ions, Cu1 and Cu3, are in the partial position 4c, where the ions are not related by the inversion center. In the triclinic modification (P -1) of Cu4O(As(P)O4)2, all four copper ions are in the centrosymmetric equivalent position 2i, which prevents DM interactions. This centrosymmetry will allow magnetic interactions in the triclinic modification of Cu4O(As(P)O4)2 to be still frustrated at lower temperature. It is possible that the triclinic modification of these compounds is a quantum spin liquid.
