论文标题
高纯度中的倾斜抗铁磁性
Canted antiferromagnetism in high purity $\mathrm{NaFeF_3}$ prepared by a novel wet-chemical synthesis method
论文作者
论文摘要
我们报告了一种新的合成方法，以及氟杆酮$ \ mathrm {nafef_3} $的结构和磁性表征。我们已经开发了一种湿化学方法，该方法允许制备具有高纯度的大量空气敏感荧光杆菌。 $ \ mathrm {nafef_3} $的néel温度（$ t_n $）为90 k，而魏斯常数（$θ$）为-124 K，对应于显性的抗铁磁相互作用。低于$ t_n $，在零场和场冷却的样品之间观察到略有差异，表明旋转和弱铁磁症。 AC磁力测定法证实了弱的铁磁性是$ \ mathrm {nafef_3} $固有的，而不是由于杂质而引起的。从粉末中子衍射数据中，我们将磁性结构恰好描述为弱倾斜的G型（磁性空间群$ pn'ma' $）。在$ pn'ma'$中允许使用铁磁成分，但是，在零磁场中可能不存在此组件，并且太小，无法根据粉末中子衍射数据进行确认。
We report a novel synthesis method for, and structural and magnetic characterization of the fluoroperovskite $\mathrm{NaFeF_3}$. We have developed a wet-chemical method that allows preparation of large volumes of air-sensitive fluoroperovskites with high purity. $\mathrm{NaFeF_3}$ has a Néel temperature ($T_N$) of 90 K and a Weiss constant ($θ$) of -124 K, corresponding to dominant antiferromagnetic interactions. Below $T_N$, a slight difference is observed between zero-field and field cooled samples, indicating spin-canting and weak ferromagnetism. AC magnetometry confirms that weak ferromagnetism is inherent to $\mathrm{NaFeF_3}$ and not due to impurities. From powder neutron diffraction data, we describe the magnetic structure precisely as a weakly canted G-type (magnetic space group $Pn'ma'$). A ferromagnetic component is allowed in $Pn'ma'$, however, this component may be absent in zero magnetic fields and is too small to be confirmed on the basis of powder neutron diffraction data.
