Continuous quantum phase transition in a Kondo lattice model

Details Continuous quantum phase transition in a Kondo lattice model Continuous quantum phase transition in a Kondo lattice model

2003-04-02

arxiv.org/abs/cond-mat/0304033v3

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; updated, to appear in PRL

Scientific paper

10.1103/PhysRevLett.91.156404

We study the magnetic quantum phase transition in an anisotropic Kondo lattice model. The dynamical competition between the RKKY and Kondo interactions is treated using an extended dynamic mean field theory (EDMFT) appropriate for both the antiferromagnetic and paramagnetic phases. A quantum Monte Carlo approach is used, which is able to reach very low temperatures, of the order of 1% of the bare Kondo scale. We find that the finite-temperature magnetic transition, which occurs for sufficiently large RKKY interactions, is first order. The extrapolated zero-temperature magnetic transition, on the other hand, is continuous and locally critical.

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