论文标题
沮丧的分层系统pdcro $ _2 $中的非常规的磁性和电子状态
Unconventional magnetism and electronic state in frustrated layered system PdCrO$_2$
论文作者
论文摘要
进行了第一原理计算和对磁性沮丧的分层材料PDCRO $ _2 $的考虑。交换参数的结果与Curie-Weiss温度（$θ$）的实验数据一致。我们表明，与Curie-Weiss温度相比，实验观察到的Néel温度（$ T_N $）的强抑制是由于三个主要因素所致。首先，正如预期的那样，这与沿$ c $轴的分层结构和相对较小的交换交互连接。其次，理想的平面120 $^{\ circ} $磁性结构的变形对于提供有限的$ t_n $值至关重要。但是，这两个因素仍然不足以解释低$ t_n $和大挫败感因子$ |θ|/t_n $。因此，我们建议在Anderson Lattice模型的框架内，PDCRO $ _2 $ t_n $的异国情调的非Fermi-liquid状态的场景，这似乎可以在定性上解释其所有主要特点。
First-principles calculations and a model consideration of magnetically frustrated layered material PdCrO$_2$ are performed. The results on the exchange parameters are in agreement with the experimental data on the Curie-Weiss temperature ($θ$). We show that experimentally observed strong suppression of the Néel temperature ($T_N$) in comparison with the Curie-Weiss temperature is due to three main factors. First, as expected, this is connected with the layered structure and relatively small exchange interaction along the $c$ axis. Second, deformation of the ideal in-plane 120$^{\circ}$ magnetic structure is crucial to provide finite $T_N$ value. However, these two factors are still insufficient to explain low $T_N$ and the large frustration factor $|θ|/T_N$. Thus, we suggest a scenario of an exotic non-Fermi-liquid state in PdCrO$_2$ above $T_N$ within the frameworks of the Anderson lattice model, which seems to explain qualitatively all its main peculiarities.
