Magnetic Impurity in Insulators with Small Energy Gap
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概要
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Static and dynamic properties of a magnetic impurity in insulators with a small energy gap are investigated by the poor man's scaling, 1/N expansion, the self-consistent perturbation method within the non-crossing approximation (NCA) and the quantum Monte Carlo (QMC) method. It is shown that the ground state of the magnetic impurity changes from the singlet to multiplet when the gap increases, as in the case of the magnetic impurity in a BCS superconductor, although there is a different feature compared to the latter. Critical value of the gap E_c is found to be E_c/T_K=2.0 by 1/N expansion and NCA, while E_c/T_K≈0.4〜0.9 by QMC, where T_K denotes the Kondo temperature. It is found by the poor man's scaling that E_c is enhanced (reduced) by the enhanced (rounded) gap-edge.
- 社団法人日本物理学会の論文
- 1993-12-15
著者
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Ogura Jun
Department Of Physics Faculty Of Sciences Saitama University
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Ogura Jun
Department Of Neurology Kohnan Hospital
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Saso Tetsuro
Department Of Physics Faculty Of Science Saitama University
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