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

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• Dr Andriy Nevidomskyy, Rutgers University
• Monday 12 January 2009, 14:15-15:15
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Dr Jonathan Keeling.

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 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. 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.

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