具有孤立CoO4四面体的Ba2CoO4的反常磁性
Anomalous Magnetic Behavior in Ba2CoO4 with Isolated CoO4 Tetrahedra
摘要：
给定材料的电子和磁性结构的维度通常由其晶体结构预先确定。在这里，使用弹性和非弹性中子散射结合磁化测量，我们发现不寻常的磁性行为在三维（3D）Ba 2CoO 4。尽管存在孤立的CoO 4四面体，但该体系在基态表现出3D非共线反铁磁有序，居里-外斯温度为110 K，而TN = 26 K。更出乎意料的是，自旋动力学显示准2D自旋波色散与一个异常大的自旋间隙，和1D磁弹性耦合。我们的研究结果表明，Ba 2CoO 4是一个独特的系统，探索孤立的多面体，低维磁性，和新的自旋态氧化物之间的相互作用。
英文摘要：
The dimensionality of the electronic and magnetic structure of a given material is generally predetermined by its crystal structure. Here, using elastic and inelastic neutron scattering combined with magnetization measurements, we find unusual magnetic behavior in three-dimensional (3D) Ba2CoO4. In spite of isolated CoO4 tetrahedra, the system exhibits a 3D noncollinear antiferromagnetic order in the ground state with an anomalously large Curie-Weiss temperature of 110 K compared to TN = 26 K. More unexpectedly, spin dynamics displays quasi-2D spin wave dispersion with an unusually large spin gap, and 1D magnetoelastic coupling. Our results indicate that Ba2CoO4 is a unique system for exploring the interplay between isolated polyhedra, low-dimensional magnetism, and novel spin states in oxides.
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