The anisotropic Kondo necklace model

A. Saguia, T.G. Rappoport, B. Boechat and M.A. Continentino

Physica A: Statistical Mechanics and its Applications, 2004, vol. 344, issue 3, 644-648

Abstract: A real-space renormalization-group approach is used to investigate the zero temperature phase diagram of the Kondo necklace (KN) model in the presence of an Ising-like anisotropy parameter (δ). In the full anisotropic case, δ=1, this approach yields a quantum critical point (QCP) separating an antiferromagnetic from a non-magnetic, Kondo-like, phase. The critical frontier of the phase diagram is presented as a function of the ratio between the coupling and the bandwith (J/W), and the anisotropic parameter (δ). We find for the KN model that a critical value δc of the anisotropy is required for the appearance of long range magnetic order at zero temperature.

Keywords: Kondo Lattice; Heavy fermions; Quantum phase transition (search for similar items in EconPapers)
Date: 2004
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:344:y:2004:i:3:p:644-648

DOI: 10.1016/j.physa.2004.06.046

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