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首页> 外文期刊>Physical Review X >Exotic Magnetic Field-Induced Spin-Superstructures in a Mixed Honeycomb-Triangular Lattice System
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Exotic Magnetic Field-Induced Spin-Superstructures in a Mixed Honeycomb-Triangular Lattice System

机译：混合蜂窝 - 三角形晶格系统中的异国情调磁场诱导的旋转结构

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摘要

The temperature–magnetic field phase diagram of the mixed honeycomb-triangular lattice system K 2 Mn 3 ( VO 4 ) 2 CO 3 is investigated by means of magnetization, heat-capacity, and neutron-scattering measurements. The results indicate that triangular and honeycomb magnetic layers undergo sequential magnetic orderings and act as nearly independent magnetic sublattices. The honeycomb sublattice orders at about 85?K in a Neél-type antiferromagnetic structure, while the triangular sublattice displays two consecutive ordered states at much lower temperatures, 3 and 2.2?K. The ground state of the triangular sublattice consists of a planar “ Y ” magnetic structure that emerges from an intermediate collinear “ up-up-down ” state. Applied magnetic fields parallel or perpendicular to the c axis induce exotic ordered phases characterized by various spin-stacking sequences of triangular layers that yield bilayer, three-layer, or four-layer magnetic superstructures. The observed superstructures cannot be explained in the framework of quasiclassical theory based only on nearest-neighbor interlayer coupling and point towards the presence of effective second-nearest-neighbor interactions mediated by fluctuations of the magnetic moments in the honeycomb sublattice.
机译：通过磁化，热容量和中子散射测量研究混合蜂窝 - 三角形晶格系统K 2mN 3（VO 4）2 CO 3的温度磁场相图。结果表明，三角形和蜂窝磁层经历连续的磁性排序并充当几乎独立的磁性子发布。蜂窝子分子在Neél型反铁磁结构中的约85Ωk处的订单，而三角形子分子显示两个连续的有序状态，在较低的温度下，3和2.2？k。三角形子分子的地位由平面的“Y”磁结构组成，从中间共线的“上下”状态出现。平行或垂直于C轴的施加磁场诱导异端的有序相，其特征在于三角形层的各种旋转堆叠序列，其产生双层，三层或四层磁性上部结构。仅基于最近的邻近中间层耦合的拟谐叠间层耦合并且朝向存在受蜂窝子分组中的磁矩波动介导的有效第二最近邻相互作用的框架的框架，观察到的上部结构不能解释。

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