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1997 | 91 | 2 | 359-362
Article title

On Magnetic Impurities in Gapless Fermi Systems

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EN
Abstracts
EN
In ordinary metals, antiferromagnetic exchange between conduction electrons and a magnetic impurity leads to screening of the impurity spin below the Kondo temperature, T_{K}. In systems such as semimetals, small-gap semiconductors and unconventional superconductors, a reduction in available conduction states near the chemical potential can greatly depress T_{K}. The behavior of an Anderson impurity in a model with a power-law density of states, ρ(ε) ∝ |ε|^{r}, r>0, for |ε|<Δp, where Δp is small compared to the bandwidth, is studied using the non-crossing approximation. The transition from the Kondo singlet to the magnetic ground state can be seen in the behavior of the impurity magnetic susceptibility χ. The product Tχ saturates at a finite value at low temperature for coupling smaller than the critical one. For sufficiently large coupling Tχ → 0, as T → 0, indicating a complete screening of the impurity spin.
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Publisher

Year
Volume
91
Issue
2
Pages
359-362
Physical description
Dates
published
1997-02
Contributors
  • Institute of Physics, A. Mickiewicz University, Matejki 48/49, 60-769 Poznań, Poland
References
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv91z228kz
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