$\bm{\mathrm{FeGa}_{3-y}\mathrm{Ge}_y}$中近藤类抗磁绝缘体到调制铁磁金属的转变
Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in $\bm{\mathrm{FeGa}_{3-y}\mathrm{Ge}_y}$
摘要：
磁性的一个基本问题是材料的磁性是由定域磁矩还是由巡游电子决定的。在这里，我们暴露的情况下，弱铁磁系统FeGa $_{3-y}$ Ge $_y$，其中这两个相反的模型是调和的，这样的磁化率定量解释考虑到自旋-自旋相关的影响。随着Ge取代引入的电子掺杂，抗磁性绝缘母体化合物FeGa $_3$早在$ y=0.01 $时就变成顺磁性金属，并且在量子临界点$ y=0.15 $附近变成弱铁磁金属。在FeGa $_{3-y}$ Ge $_y$的铁磁区域内，磁性具有弱巡回铁磁性质，位于局域和巡回主导之间的中间区域。我们的分析意味着所有巡游电子铁磁体的潜在的普遍性。
英文摘要：
One initial and essential question of magnetism is whether the magnetic properties of a material are governed by localized moments or itinerant electrons. Here we expose the case for the weakly ferromagnetic system FeGa$_{3-y}$Ge$_y$ wherein these two opposite models are reconciled, such that the magnetic susceptibility is quantitatively explained by taking into account the effects of spin-spin correlation. With the electron doping introduced by Ge substitution, the diamagnetic insulating parent compound FeGa$_3$ becomes a paramagnetic metal as early as at $ y=0.01 $, and turns into a weakly ferromagnetic metal around the quantum critical point $ y=0.15 $. Within the ferromagnetic regime of FeGa$_{3-y}$Ge$_y$, the magnetic properties are of a weakly itinerant ferromagnetic nature, located in the intermediate regime between the localized and the itinerant dominance. Our analysis implies a potential universality for all itinerant-electron ferromagnets.
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