论文标题
CA3CO2O6中跨场过渡的特殊磁化动力学
Peculiar magnetic dynamics across the in-field transition in Ca3Co2O6
论文作者
论文摘要
在晶体上均匀的化合物Ca $ _3 $ co $ _2 $ o $ _6 $中发现了多个共存的磁性阶段，刺激了正在进行的研究活动。近年来，主要的重点是零场状态属性，在该属性中已经建立了非常长的尺度。在这项研究中，我们报告了对CA $ _3 $ co $ _2 $ o $ o $ $ _6 $的静态和动态特性的详细研究，整个磁场诱导了3.5吨的过渡。到目前为止，该区域实际上被忽略了，而我们认为在某些方面代表了$ b = 0 $ b = 0 $ $ b = 0 $ $ b = 0 $。在研究AC敏感性的频率依赖性时，我们发现在高场侧（$ b> 3.5 $ t）响应对应于磁簇的相对较窄的分布。该分布似乎非常微弱地取决于磁场，相关的能屏障约为200 k。下一次贡献低于3.5 t，其特征频率较小，温度和磁场依赖性较小。我们在磁矩的链内和链间聚类的背景下讨论了这些发现。
The discovery of multiple coexisting magnetic phases in a crystallographically homogeneous compound Ca$_3$Co$_2$O$_6$ has stimulated an ongoing research activity. In recent years the main focus has been on the zero field state properties, where exceedingly long time scales have been established. In this study we report a detailed investigation of static and dynamic properties of Ca$_3$Co$_2$O$_6$ across the magnetic field induced transition around 3.5 T. This region has so far been practically neglected while we argue that in some aspects it represents a simpler version of the transition across the $B = 0$ state. Investigating the frequency dependence of the ac susceptibility we reveal that on the high field side ($B > 3.5$ T) the response corresponds to a relatively narrow distribution of magnetic clusters. The distribution appears very weakly dependent on magnetic field, with an associated energy barrier of around 200 K. Below 3.5 T a second contribution arises, with much smaller characteristic frequencies and a strong temperature and magnetic field dependence. We discuss these findings in the context of intra-chain and inter-chain clustering of magnetic moments.
