论文标题
1t-fe $ _ {0.05} $ tas $ _2 $中反铁磁性的稳定
Stabilization of antiferromagnetism in 1T-Fe$_{0.05}$TaS$_2$
论文作者
论文摘要
1T-TAS $ _2 $是具有莫特绝缘态的原型电荷密度波（CDW）系统。通常，莫特绝缘子伴有抗磁磁性状态。但是，从未在1T-TAS $ _2 $中观察到抗铁磁序。在这里，我们通过将少量的Fe插入1T-TAS $ _2 $的Van der Waals间隙中，即形成1T-FE $ _ {0.05} $ tas $ _2 $，从而报告了反铁磁序的稳定。从300 k冷却后，电阻率随温度降低而增加，然后在15〜K左右达到最大值，该值接近根据我们的磁敏感性测量确定的NEEL温度。当样品厚度减小时，可以完全抑制抗磁性状态，表明fe $ _ {0.05} $ tas $ _2 $中的抗铁磁序具有不可忽略的三维特征。对于散装Fe $ _ {0.05} $ tas $ _2 $，我们的高压电气传输数据与1T-TAS $ _2 $的比较表明，在环境压力下，Fe $ _ {0.05} $ tas $ _2 $ _2 $在几乎是熟悉的电荷密度密度（NCCDW）阶段几乎是固有的，该阶段几乎是uncott in Chere nincul ninculation ninculation ninst in ninst ins ninst in unst of Mott oft oft somott oft of the Moott ott somott oft somott。因此，温度压力相图揭示了莫特绝缘状态的抗铁磁性的有趣脱钩。
1T-TaS$_2$ is a prototypical charge-density-wave (CDW) system with a Mott insulating ground state. Usually, a Mott insulator is accompanied by an antiferromagnetic state. However, the antiferromagnetic order had never been observed in 1T-TaS$_2$. Here, we report the stabilization of the antiferromagnetic order by the intercalation of a small amount of Fe into the van der Waals gap of 1T-TaS$_2$, i.e. forming 1T-Fe$_{0.05}$TaS$_2$. Upon cooling from 300~K, the electrical resistivity increases with a decreasing temperature before reaching a maximum value at around 15~K, which is close to the Neel temperature determined from our magnetic susceptibility measurement. The antiferromagnetic state can be fully suppressed when the sample thickness is reduced, indicating that the antiferromagnetic order in Fe$_{0.05}$TaS$_2$ has a non-negligible three-dimensional character. For the bulk Fe$_{0.05}$TaS$_2$, a comparison of our high pressure electrical transport data with that of 1T-TaS$_2$ indicates that, at ambient pressure, Fe$_{0.05}$TaS$_2$ is in the nearly commensurate charge-density-wave (NCCDW) phase near the border of the Mott insulating state. The temperature-pressure phase diagram thus reveals an interesting decoupling of the antiferromagnetism from the Mott insulating state.
