在 FeGaGe 中从类近藤顺磁绝缘体到调制的铁磁金属的转变。
Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in FeGaGe.
机构信息
Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;
School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
出版信息
Proc Natl Acad Sci U S A. 2018 Mar 27;115(13):3273-3278. doi: 10.1073/pnas.1713662115. Epub 2018 Mar 12.
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 Ge , 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 becomes a paramagnetic metal as early as at y=0.01, and turns into a weakly ferromagnetic metal around the quantum critical point =0.15. Within the ferromagnetic regime of FeGa Ge , 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.
一个关于磁性的初始和基本问题是，材料的磁性特性是由局域矩还是巡游电子决定的。在这里，我们揭示了弱铁磁体系 FeGaGe 的情况，在该体系中，这两种相反的模型得到了调和，使得通过考虑自旋-自旋关联的影响，可以定量地解释磁化率。通过 Ge 取代引入电子掺杂，反铁磁绝缘母体化合物 FeGa 在 y=0.01 时就变成了顺磁金属，在量子临界点 y=0.15 时变成了弱铁磁金属。在 FeGaGe 的铁磁区，磁性质具有弱巡游铁磁性质，位于局域主导和巡游主导之间的中间区。我们的分析意味着所有巡游电子铁磁体都具有潜在的普遍性。
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