Layered Kondo Lattice Model for Quantum Critical β-YbAlB4
Layered Kondo Lattice Model for Quantum Critical β-YbAlB4
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DOI：
10.1103/physrevlett.102.077202
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发表时间：
2009-02-20
影响因子：
8.6
通讯作者：
Coleman, P.
中科院分区：
文献类型：
--
作者：
Nevidomskyy, Andriy H.;Coleman, P.
我们分析了量子临界重费米子超导体beta-YbAlB_4的磁性和电子性质，计算了费米面和与de Haas-van Alphen测量相关的极值轨道的角度依赖性。结合真实材料模型和单离子晶体场分析，我们提出了该系统的分层Kondo晶格模型，其中二维硼层通过层间Yb矩在J（z）=+/- 5/2态下进行Kondo耦合.该模型适合测量的单离子磁化率和预测的电子各向异性的实质性变化的系统是通过量子临界点的压力调谐。
We analyze the magnetic and electronic properties of the quantum critical heavy fermion superconductor beta-YbAlB4, calculating the Fermi surface and the angular dependence of the extremal orbits relevant to the de Haas-van Alphen measurements. Using a combination of the realistic materials modeling and single-ion crystal field analysis, we are led to propose a layered Kondo lattice model for this system, in which two-dimensional boron layers are Kondo coupled via interlayer Yb moments in a J(z)=+/- 5/2 state. This model fits the measured single-ion magnetic susceptibility and predicts a substantial change in the electronic anisotropy as the system is pressure tuned through the quantum critical point.