Frustration and the Kondo Effect in Heavy Fermion Materials
Frustration and the Kondo Effect in Heavy Fermion Materials
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DOI：
10.1007/s10909-010-0213-4
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发表时间：
2010-10-01
影响因子：
2
通讯作者：
Nevidomskyy, Andriy H.
中科院分区：
文献类型：
--
作者：
Coleman, Piers;Nevidomskyy, Andriy H.
在最近的实验中观察到的反铁磁相界和小-大费米表面转变之间的分离，导致的建议，挫折是一个重要的额外的调谐参数在近藤晶格模型的重费米子材料。在相图中引入近藤（K）和阻挫（Q）轴，使我们能够从更广阔的角度讨论重费米子材料的物理。目前的实验情况进行了分析，在这种结合的“QK”相图的上下文中。我们讨论了各种理论模型的挫折近藤晶格，使用一般的参数来表征的f-电子局域化之间发生的自旋液体和重费米液体基态的过渡的性质。我们特别集中在Shastry-Sutherland Kondo晶格模型，我们建立了定性的相图，使用强耦合参数和大N展开。最后，本文对未来有前途的理论方向作了一些简短的评论。
The observation of a separation between the antiferromagnetic phase boundary and the small-large Fermi surface transition in recent experiments has led to the proposal that frustration is an important additional tuning parameter in the Kondo lattice model of heavy fermion materials. The introduction of a Kondo (K) and a frustration (Q) axis into the phase diagram permits us to discuss the physics of heavy fermion materials in a broader perspective. The current experimental situation is analyzed in the context of this combined "QK" phase diagram. We discuss various theoretical models for the frustrated Kondo lattice, using general arguments to characterize the nature of the f-electron localization transition that occurs between the spin liquid and heavy Fermi liquid ground-states. We concentrate in particular on the Shastry-Sutherland Kondo lattice model, for which we establish the qualitative phase diagram using strong coupling arguments and the large-N expansion. The paper closes with some brief remarks on promising future theoretical directions.