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arXiv 1212.3166cond-mat.str-el
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立方重费米子化合物Ce3Pd20Si6中近藤效应的破坏

Destruction of Kondo effect in cubic heavy fermion compound Ce3Pd20Si6

J. Custers, K. -A. Lorenzer, M. Müller, A. Prokofiev, A. Sidorenko, H. Winkler, A. M. Strydom, Y. Shimura, T. Sakakibara, R. Yu, Q. Si, S. Paschen

摘要:

量子物质的基态如何相互转换,揭示了对稳定它们的机制的深刻见解。相应地,量子相变在许多材料类别中被探索,其中重费米子化合物是最突出的。最近对各向异性重费米子化合物的研究表明,不同类型的跃迁是由化学或外部压力的变化引起的[1-3],这就提出了重费米子量子临界性在多大程度上是普遍的问题。要取得进展,必须拓宽材料基础和微观参数的变化范围。在这里,我们确定了一个立方重费米子材料表现出场诱导量子相变,并显示如何材料可以用来探索维度轴的一个极端。两个不同的有序相之间的过渡是伴随着费米面的突然变化,让人想起发生了什么跨场诱导的反铁磁到顺磁的各向异性YbRh 2Si 2的过渡。这一发现导致了一个基于材料的全球相图-一个统一的理论描述的先决条件。

英文摘要:

How ground states of quantum matter transform between one another reveals deep insights into the mechanisms stabilizing them. Correspondingly, quantum phase transitions are explored in numerous materials classes, with heavy fermion compounds being among the most prominent ones. Recent studies in an anisotropic heavy fermion compound have shown that different types of transitions are induced by variations of chemical or external pressure [1-3], raising the question of the extent to which heavy fermion quantum criticality is universal. To make progress, it is essential to broaden both the materials basis and the microscopic parameter variety. Here, we identify a cubic heavy fermion material as exhibiting a field-induced quantum phase transition, and show how the material can be used to explore one extreme of the dimensionality axis. The transition between two different ordered phases is accompanied by an abrupt change of Fermi surface, reminiscent of what happens across the field-induced antiferromagnetic to paramagnetic transition in the anisotropic YbRh2Si2. This finding leads to a materials-based global phase diagram -- a precondition for a unified theoretical description.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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