Properties of anisotropic magnetic impurities on surfaces - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Using numerical renormalization group techniques, we study static and dynamicproperties of a family of single-channel Kondo impurity models with axialmagnetic anisotropy $DS z^2$ terms; such models are appropriate to describemagnetic impurity atoms adsorbed on non-magnetic surfaces, which may exhibitsurface 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 fullycompensated impurity spin. The approach to the stable fixed point depends onthe value of the spin $S$ and on the ratio $D-T K^{0}$, where $T K^{0}$ isthe Kondo temperature in the absence of the anisotropy. For S=1, the screeningoccurs in two stages if $DT K^{0}$. For negative anisotropy $D$, the system is anon-Fermi liquid with residual anisotropic exchange interaction. However, thepresence of transverse magnetic anisotropy $ES x^2-S y^2$ restoresFermi-liquid behavior in real systems.



Author: Rok Zitko, Robert Peters, Thomas Pruschke

Source: https://arxiv.org/







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