科研之友
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摘要
We have studied the effect of anisotropies on the quantum phase transition of the Kondo necklace model in dimensions D=1, 2, and 3. Both the anisotropy delta of the intersite interaction term and anisotropy Delta of the on-site Kondo interaction have been included. We use a bond operator method with constraints implemented in mean-field approximation. Starting from the paramagnetic phase we determine the critical ratio (t/J)(c) of the quantum critical point and associated scaling exponents of the Kondo-singlet gap. We show that in the case of easy-axis type anisotropy delta > 1 a qualitatively different behavior in comparison to the conventional Kondo necklace model with (delta,Delta)=(0,1) appears.
- 出版日期2006-7
