标题： Kondo-like行为在混合价态的氧氮化物$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ 显示英文标题

标题： Kondo-like behavior in a mixed valent oxypnictide $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$

摘要： 我们通过磁化率、电阻率和比热测量合成了并表征了层状混合价态氧氮化物$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$的物理性质。 尽管$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$在 T = 0.5 K 下不表现出超导性，但它在$\mathrm{T_{min}}$= 13.7 K 处显示出一个有趣的电阻率极小值。在施加的磁场为$\mathrm{\mu_{0}H}$= 9 T 下观察到电阻率极小值的消失，以及在低温下负的磁阻和高温下正的磁阻，这典型地体现了类似 Kondo 的自旋依赖散射和三维弱局域化。 我们认为 Kondo 散射是一个更合理的解释，因为在磁化率中观察到了低于温度偏离居里-韦斯定律的行为，这与顺磁$\mathrm{Cu^{2+}}$离子之间存在磁相互作用以及这些$\mathrm{Cu^{2+}}$磁矩的 Kondo 屏蔽一致。 我们通过详细描述化学键合，补充了实验表征，采用密度泛函理论（DFT）计算和晶体轨道哈密顿占据（COHP）分析对$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$和同结构的$\mathrm{La_{3}Ni_{4}P_{4}O_{2}}$进行研究，这是一种超导体，其临界温度为$\mathrm{T_c = 2.2}$K。基于所进行的计算，我们展示了$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$和$\mathrm{La_{3}Ni_{4}P_{4}O_{2}}$在费米能级电子态特性上的差异。这种差异影响结构稳定性，并可能导致$\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$在 T = 0.5 K 时缺乏超导性。 显示英文摘要

摘要： We have synthesized and characterized the physical properties of a layered, mixed valent oxypnictide $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ via magnetization, electrical resistivity, and specific heat measurements. Although $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ does not exhibit superconductivity down to T = 0.5 K, it demonstrates an intriguing resistivity minimum observed at $\mathrm{T_{min}}$ = 13.7 K. Disappearance of the resistivity minimum under an applied magnetic field of $\mathrm{\mu_{0}H}$ = 9 T together with the negative magnetoresistance at low and positive at high temperatures are observed, which are typical for both Kondo-like spin-dependent scattering and 3D weak localization. We argue that the Kondo scattering is a more plausible explanation due to the low-temperature deviation from a Curie-Weiss law observed in the magnetic susceptibility, consistent with the presence of magnetic interactions between paramagnetic $\mathrm{Cu^{2+}}$ ions and Kondo screening of these $\mathrm{Cu^{2+}}$ moments. We supplemented the experimental characterization with a detailed description of chemical bonding, employing density functional theory (DFT) calculations and crystal orbital Hamilton population (COHP) analysis for $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ and isostructural $\mathrm{La_{3}Ni_{4}P_{4}O_{2}}$, which is a superconductor with $\mathrm{T_c = 2.2}$ K. Based on the calculations performed, we present the difference between $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ and $\mathrm{La_{3}Ni_{4}P_{4}O_{2}}$ in the character of electronic states at the Fermi level. This discrepancy impacts structural stability and may cause a lack of superconductivity in $\mathrm{La_{3}Cu_{4}P_{4}O_{2}}$ down to T = 0.5 K.