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Layered Kondo lattice model for novel quantum critical compound beta-YbAlB4

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We perform a theoretical analysis of the magnetic and electronic properties of the quantum critical heavy fermion superconductor beta-YbAlB4. Using a combination of the realistic material modelling and single-ion crystal field analysis, we propose a layered Kondo lattice model for this system, in which two dimensional boron layers are Kondo-coupled via interlayer Yb moments in a Jz = 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. An interesting connection is made between this model and the Kondo effect in Coulomb-blockaded quantum dots. We also calculate the Fermi surface and the angular dependence of the extremal orbits relevant to the de Haas-van Alphen measurements.

This talk is part of the Irregular seminars in TCM series.

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