Tuning the Dimensionality of the Heavy Fermion Compound CeIn3
Tuning the Dimensionality of the Heavy Fermion Compound CeIn3
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DOI：
10.1126/science.1183376
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发表时间：
2010-02-19
期刊：
影响因子：
56.9
通讯作者：
Matsuda, Y.
中科院分区：
文献类型：
--
作者：
Shishido, H.;Shibauchi, T.;Matsuda, Y.
低维和强相互作用的凝聚态系统通常表现出不寻常的电子特性。在重费米子化合物中存在着有效质量大大增强的强关联电子，其电子结构基本上是三维的。我们在实验上实现了一个二维重费米子系统，以可控的方式调整维数。人工超晶格的反铁磁重费米子化合物CeIn 3和传统的金属LaIn 3外延生长。通过减小CeIn 3层的厚度，磁有序被抑制，有效电子质量进一步提高。被限制在二维空间的重费米子显示出与标准费米液体低温电子性质的显著偏差，这些都与量子临界的维度调谐有关。
Condensed-matter systems that are both low-dimensional and strongly interacting often exhibit unusual electronic properties. Strongly correlated electrons with greatly enhanced effective mass are present in heavy fermion compounds, whose electronic structure is essentially three-dimensional. We realized experimentally a two-dimensional heavy fermion system, adjusting the dimensionality in a controllable fashion. Artificial superlattices of the antiferromagnetic heavy fermion compound CeIn3 and the conventional metal LaIn3 were grown epitaxially. By reducing the thickness of the CeIn3 layers, the magnetic order was suppressed and the effective electron mass was further enhanced. Heavy fermions confined to two dimensions display striking deviations from the standard Fermi liquid low-temperature electronic properties, and these are associated with the dimensional tuning of quantum criticality.