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Phase diagram of the Kondo lattice model on the kagome lattice

机译:舞果晶格上的近藤晶格模型的相图

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摘要

We consider the potential for novel forms of magnetism arising from the subtle interplay between electrons and spins in the underscreened kagome Kondo lattice model. At weak coupling, we show that incommensurate noncoplanar multiwave vector magnetic orders arise at nearly all fillings and that this results from Fermi surface effects that introduce competing interactions between the spins. At strong coupling, we find that such a complex order survives near half filling despite the presence of ferromagnetism at all other fillings. We show this arises due to state selection among a massive degeneracy of states at infinite coupling. Finally, we show that at intermediate filling only commensurate orders seem to survive, but these orders still include noncoplanar magnetism. So, the mere presence of both local moments and itinerant electrons enables complex orders to form unlike any currently observed in kagome materials.
机译:我们认为,在筛选不足的果戈姆近藤晶格模型中,电子与自旋之间的微妙相互作用会产生新型磁性形式。在弱耦合下,我们显示出几乎所有的填充物都出现了不相称的非共面多波矢量磁阶,这是由于费米表面效应引起的,它们之间存在竞争相互作用。在强耦合下,我们发现尽管所有其他填充物中都存在铁磁性,但这种复杂的顺序在填充的一半附近仍然存在。我们表明,这是由于在无限耦合状态中大量退化状态中的状态选择而引起的。最后,我们表明,在中间填充时,只有相称的阶似乎可以幸存,但是这些阶仍包含非共面磁性。因此,仅仅存在局部力矩和流动电子,就可以形成复杂的有序结构,这与kagome材料中目前所观察到的情况不同。

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  • 来源
    《Physical review》 |2016年第2期|024401.1-024401.14|共14页
  • 作者单位

    Laboratory of Atomic And Solid State Physics, Cornell University, Ithaca, New York 14853, USA;

    Department of Physics, Binghamton University, Binghamton, New York, USA;

    Laboratory of Atomic And Solid State Physics, Cornell University, Ithaca, New York 14853, USA;

    Department of Physics, Binghamton University, Binghamton, New York, USA;

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