Candidate quantum spin liquid due to dimensional reduction of a two-dimensional honeycomb lattice.
Candidate quantum spin liquid due to dimensional reduction of a two-dimensional honeycomb lattice.
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二维蜂窝晶格降维引起的候选量子自旋液体
DOI：
10.1038/srep06451
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发表时间：
2014-09-23
影响因子：
4.6
通讯作者：
Zhu D
中科院分区：
文献类型：
--
作者：
Zhang B;Zhang Y;Wang Z;Wang D;Baker PJ;Pratt FL;Zhu D
与基于二维三角晶格和kagome晶格的量子自旋液体一样，具有强自旋轨道耦合或令人沮丧的第二最近邻耦合的二维蜂窝晶格有望成为候选量子自旋液体的来源。从溶液中得到了一种含有六方Cu ~（2+）层的铵盐[（C_3H_7）_3NH]_2 [Cu_2（C_2O_4）_3]（H_2O）_2.2。从单晶X射线衍射，比热和磁化率测量，没有观察到结构转变或长程磁有序从290 K到2 K。 阴离子层被铵和H_2O层隔开，间距为3.5 μ m，阴离子层之间没有明显的相互作用。二维蜂窝晶格由Jahn-Teller畸变的Cu 2+和草酸根阴离子构成，显示出S = 1/2金属原子之间的强反铁磁相互作用，θ = −120（1）K。轨道分析表明，Cu ~（2+）离子通过桥键的相互作用呈现出沿轴沿着弱铁磁相互作用和沿轴沿着强反铁磁相互作用的条纹模式。的磁化率的分析表明，它是由一个准一维的贡献与自旋链，至少是众所周知的准一维自旋液体的那些隔离为主。
As with quantum spin liquids based on two-dimensional triangular and kagome lattices, the two-dimensional honeycomb lattice with either a strong spin-orbital coupling or a frustrating second-nearest-neighbor coupling is expected to be a source of candidate quantum spin liquids. An ammonium salt [(C3H7)3NH]2[Cu2(C2O4)3](H2O)2.2containing hexagonal layers of Cu2+was obtained from solution. No structural transition or long-range magnetic ordering was observed from 290 K to 2 K from single crystal X-ray diffraction, specific heat and susceptibility measurements. The anionic layers are separated by sheets of ammonium and H2O with distance of 3.5 Å and no significant interaction between anionic layers. The two-dimensional honeycomb lattice is constructed from Jahn-Teller distorted Cu2+and oxalate anions, showing a strong antiferromagnetic interaction betweenS= 1/2 metal atoms with θ = −120 (1) K. Orbital analysis of the Cu2+interactions through the oxalate-bridges suggests a stripe mode pattern of coupling with weak ferromagnetic interaction along thebaxis and strong antiferromagnetic interaction along theaaxis. Analysis of the magnetic susceptibility shows that it is dominated by a quasi-one-dimensional contribution with spin chains that are at least as well isolated as those of well-known quasi-one-dimensional spin liquids.