Itinerant-Localized Transitions in Magnetic Phases of the Periodic Anderson Model
Itinerant-Localized Transitions in Magnetic Phases of the Periodic Anderson Model
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DOI：
10.1016/j.phpro.2015.12.027
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Kubo
中科院分区：
文献类型：
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作者：
K. Kubo
为了阐明非电子磁相材料中费米面重构（Lifshitz跃迁）的特性，我们采用变分Monte Carlo方法研究了周期安德森模型的磁有序态.作为变分波函数，我们使用Gutzwiller波函数的顺磁，反铁磁，铁磁状态。在半填充附近，我们发现一个反铁磁相，远离半填充，我们发现一个铁磁相作为基态。在两个磁相内，发生Lifshitz转变。在Lifshitz转换处，有序矩的大小发生变化。为了进一步理解Lifshitz跃迁，我们还通过计算费米动量处动量分布函数的跳跃来分析f-电子对费米面的贡献。然后，我们发现，在大的有序矩的状态，f-电子的费米面的贡献变得很小。这一观察清楚地表明，这些Lifshitz跃迁是f电子的巡回局域跃迁。
To clarify the characteristics of Fermi-surface reconstruction, called Lifshitz transitions, in magnetic phases off-electron materials, we investigate magnetically ordered states of the periodic Anderson model by applying the variational Monte Carlo method. As variational wavefunctions, we use the Gutzwiller wavefunctions for the paramagnetic, antiferromagnetic, and ferromagnetic states. Around half-filling, we find an antiferromagnetic phase, and far away from half-filling, we find a ferromagnetic phase as the ground state. Inside both magnetic phases, Lifshitz transitions take place. At the Lifshitz transitions, the sizes of the ordered moments change. In order to understand the Lifshitz transitions further, we also analyze thef -electron contribution to the Fermi surface by evaluating the jump in the momentum distribution function at the Fermi momentum. Then, we find that, in the large ordered-moment states, thef-electron contribution to the Fermi surface becomes small. This observation clearly shows that these Lifshitz transitions are itinerant-localized transitions of thefelectrons.