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Influence of local spin polarization to the Kondo effect |
| LI Huan, LI Huan, GUO Wei, GUO Wei |
| School of Physics, Peking University, Beijing 100871, China |
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Abstract We use the spin non-degenerate single impurity Anderson model to investigate the influence of the local spin polarization to the Kondo effect. By using the Schrieffer-Wolff transformation, we obtain a generalized s-d exchange Hamiltonian, which describes the interaction between a polarized local spin and conduction electrons. In this case, the singlet is no longer an eigenstate as shown by variational calculations where the splitting of the local energy Δ = εd↑-εd↓ can be arbitrarily small. The local spin polarization generates the instability of the singlet ground state of the S = 1/2 s-d exchange model.
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Issue Date: 05 March 2007
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