1 T-Fe $_{0.05}$ TaS $_2$中反铁磁性的稳定化
Stabilization of antiferromagnetism in 1T-Fe$_{0.05}$TaS$_2$
摘要：
1 T-TaS $_2$是一个典型的电荷密度波（CDW）系统，具有Mott绝缘基态。通常，莫特绝缘体伴随着反铁磁态。然而，在1 T-TaS $_2$中从未观察到反铁磁有序。在这里，我们报告的反铁磁秩序的稳定性的嵌入到1 T-TaS $_2$的范德华能隙的少量的Fe，即形成1 T-Fe $_{0.05}$ TaS $_2$。在从300 ° K冷却后，电阻率随着温度的降低而增加，然后在15 ° K左右达到最大值，这接近于由我们的磁化率测量确定的Neel温度。当样品厚度减小时，反铁磁态被完全抑制，表明Fe $_{0.05}$ TaS $_2$中的反铁磁有序具有不可忽略的三维特征.对于体Fe $_{0.05}$ TaS $_2$，我们的高压电输运数据与1 T-TaS $_2$的比较表明，在环境压力下，Fe $_{0.05}$ TaS $_2$是在近相称的电荷密度波（NCCDW）相附近的莫特绝缘状态的边界。因此，温度-压力相图揭示了一个有趣的去耦的反铁磁性从莫特绝缘状态。
英文摘要：
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.
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