Quantum Monte Carlo and Numerical Renormalization Group Studies of Magnetic Impurities in Nonmetallic Systems
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概要
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We study magnetic properties of a single-impurity Anderson model in the symmetric case, in which the density of states for conduction electrons vanishes in a finiteenergy gap containing the Fermi energy. A quantum Monte Carlo simttlation at finitetemperatures and low-energy excitations calculated by a numerical remtormalizationgroup method reveal that at low temperatures the impurity magnetic susceptibilityfollows Curie's law. This behavior is consistent that the ground state is a doublet. Thelow-temperature Curie constant decreases monotonically with decreasing energy gapand the critical point is the zero gap. In the narrow gap limit, the impurity g-value ofthe doublet state is proportional to the gap width. This situation is due to the specialfeature of the symmetric case.[Kondo effect, nonmetallic system, quantum Monte Carlo method, numerical ll renormalization group methodl
- 社団法人日本物理学会の論文
- 1992-10-15
著者
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Takegahara Katsuhiko
Department Of Material Science And Technology Hirosaki University
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Takegahara Katsuhiko
Department Of Physics Tohoku University:education Center For Information Processing Tohoku Universit
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Shimizu Yukihiro
Department Of Applied Physics Tohoku University
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Sakai Osamu
Department Of Electronic Science And Engineering Kyoto University
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Sakai Osamu
Department Of Cardiovascular Surgery Kyoto Prefectural University Of Medicine
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