Zero-Temperature Magnetic Transition in an Easy-Axis Kondo Lattice Model
Speaker:
Jian-Xin Zhu, Los Alamos National Laboratory
Date & Time:
January 15, 2008 - 1:30pm
Location:
Room 385E | Zero-Temperature Magnetic Transition in an Easy-Axis Kondo Lattice Model Physics and Astronomy |
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| Jian-Xin Zhu, Los Alamos National Laboratory 1:30 PM, Room 385E We address the quantum transition of a spin-1/2 antiferromagnetic Kondo lattice model with an easy-axis anisotropy using the extended dynamical mean field theory. We derive results in real frequency using the bosonic numerical renormalization group (bNRG) method and compare them with Quantum Monte Carlo results in Matsubara frequency. The bNRG results show a logarithmic divergence in the critical local spin susceptibility, signaling a destruction of Kondo screening. The T=0 transition is consistent with being second order. The bNRG results also display some subtle features; we identify their origin and suggest means for further microscopic studies. |