Layered Kondo lattice model for quantum critical beta-YbAlB4.
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 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.
Nevidomskyy
Andriy H
AH
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA. nevidomskyy@cantab.net
Coleman
P
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