论文标题
沮丧的尖晶石和kagome磁铁中的非卡拉纳尔多k状态
Noncoplanar multi-k states in frustrated spinel and kagome magnets
论文作者
论文摘要
我们通过分析和数字研究在零和有限磁场上的Pyrochlore和Kagome Lattices上沮丧的Heisenberg模型的经典基础状态。每个模型在显微镜参数空间中都有一个较宽的区域，在该空间中，传播载体被转变为相当于与非平凡恒星的相互晶格矢量的一半相称的位置。在这些区域内，两种模型的零视野接地状态都对应于非Coplanar Triple-K自旋构型。 3-K状态的普遍外观可能与自旋空间维度有关。强磁场会冻结纵向旋转组件，从而降低了自旋空间尺寸。因此，我们发现了两个自旋模型被应用场诱导的双K磁结构的过渡。 3-K和2K状态之间的预测过渡可以解释在磁场下在Cubic Spini2O4和GeCO2O4中实验观察到的迄今无法解释的转变。
We investigate analytically and numerically the classical ground states of frustrated Heisenberg models on pyrochlore and kagome lattices in zero and finite magnetic fields. Each model has a wide region in the microscopic parameter space, where the propagation vector is turned to a commensurate position equal to a half of the reciprocal lattice vector with a nontrivial star. Within these regions the zero-field ground states for both models correspond to noncoplanar triple-k spin configurations. A universal appearance of the 3-k states can be related to the spin-space dimensionality. A strong magnetic field freezes the longitudinal spin component reducing the spin-space dimensionality. Accordingly, we find transitions into the double-k magnetic structures induced by applied field for both spin models. The predicted transition between 3-k and 2-k states may explain the hitherto unexplained transitions observed experimentally in cubic spinels GeNi2O4 and GeCo2O4 under magnetic field.
