Properties of anisotropic magnetic impurities on surfaces

Details Properties of anisotropic magnetic impurities on surfaces Properties of anisotropic magnetic impurities on surfaces

2008-09-04

arxiv.org/abs/0809.0759v1

Phys. Rev. B 78, 224404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 12 figures

Scientific paper

10.1103/PhysRevB.78.224404

Using numerical renormalization group techniques, we study static and dynamic properties of a family of single-channel Kondo impurity models with axial magnetic anisotropy $DS_z^2$ terms; such models are appropriate to describe magnetic impurity atoms adsorbed on non-magnetic surfaces, which may exhibit surface Kondo effect. We show that for positive anisotropy $D$ and for any spin $S$, the systems behave at low temperatures as regular Fermi liquids with fully compensated impurity spin. The approach to the stable fixed point depends on the value of the spin $S$ and on the ratio $D/T_K^{(0)}$, where $T_K^{(0)}$ is the Kondo temperature in the absence of the anisotropy. For S=1, the screening occurs in two stages if $DT_K^{(0)}$. For negative anisotropy $D$, the system is a non-Fermi liquid with residual anisotropic exchange interaction. However, the presence of transverse magnetic anisotropy $E(S_x^2-S_y^2)$ restores Fermi-liquid behavior in real systems.

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