Layered Kondo lattice model for quantum critical beta-YbAlB4

Details Layered Kondo lattice model for quantum critical beta-YbAlB4 Layered Kondo lattice model for quantum critical beta-YbAlB4

2008-11-19

arxiv.org/abs/0811.3220v2

Phys. Rev. Lett. 102, 077202 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Fig.3 and 4 have been updated, typos corrected in v2. Published at http://link.aps.org/doi/10.1103/PhysRevLett.102.077202

Scientific paper

10.1103/PhysRevLett.102.077202

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 $J_{z}=\pm 5/2$ 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.

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