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首页> 外文期刊>Physical review >Heavy quasiparticles formed in the ferromagnetic Yb layers in the Kondo helical magnet YbNi_3Al_9 as revealed by specific-heat measurements
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Heavy quasiparticles formed in the ferromagnetic Yb layers in the Kondo helical magnet YbNi_3Al_9 as revealed by specific-heat measurements

机译:通过比热测量发现,在近藤螺旋磁铁YbNi_3Al_9的铁磁Yb层中形成了重的准粒子

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摘要

We report specific-heat and magnetocaloric-effect studies on single-crystalline Kondo helical magnet YbNi_3Al_9. Molecular field analysis of a Schottky peak due to the Zeeman splitting of the Yb-ion doublet crystalline-field ground state demonstrates that the interlayer antiferromagnetic exchange interactions are 2 orders of magnitude smaller than that of the intralayer ferromagnetic coupling among Yb ions, reflecting realization of magnetically well separated Yb layers. The Sommerfeld coefficient γ, which is 110 mJ/K~2 mol in zero field, decreases smoothly with increasing field without any noticeable anomalies at the helical magnetic phase boundary. This fact confirms that heavy quasiparticles are formed on a part of the Fermi surface away from "hot sheets" that have nesting instabilities responsible for the helical magnetic structure. These results indicate that YbNi_3Al_9 is a novel system where heavy quasiparticles are confined within the two-dimensional Yb layers.
机译:我们报告了单晶近藤螺旋磁体YbNi_3Al_9的比热和磁热效应研究。 Yb离子双峰晶体场基态的塞曼分裂引起的肖特基峰的分子场分析表明,层间反铁磁交换相互作用比Yb离子之间的层内铁磁耦合小2个数量级,反映了实现磁性良好分离的Yb层。零磁场下的Sommerfeld系数γ为110 mJ / K〜2 mol,随着磁场的增加而平滑减小,在螺旋磁相边界处没有任何明显的异常。这一事实证实,在费米表面上远离“热片”的部分上形成了重的准粒子,这些“热片”具有造成螺旋磁性结构的嵌套不稳定性。这些结果表明,YbNi_3Al_9是一种新型系统,其中重的准粒子被限制在二维Yb层内。

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