Nonlinear Sigma Model Analysis of the AFM Phase Transition of the Kondo Lattice

Details Nonlinear Sigma Model Analysis of the AFM Phase Transition of the Kondo Lattice Nonlinear Sigma Model Analysis of the AFM Phase Transition of the Kondo Lattice

2008-08-27

arxiv.org/abs/0808.3788v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

We have studied the antiferromagnetic quantum phase transition of a 2D Kondo-Heisenberg square lattice using the non-linear sigma model. A renormalization group analysis of the competing Kondo -- RKKY interaction was carried out to 1-loop order in the $\epsilon$ expansion, and a new quantum critical point is found, dominated by Kondo fluctuations. In addition, the spin-wave velocity scales logarithmically near the new QCP, i.e breakdown of hydrodynamic behavior. The results allow us to propose a new phase diagram near the AFM fixed point of this 2D Kondo lattice model.

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