Numerical Renormalization Group Study of Magnetic Impurities in Superconductors
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概要
- 論文の詳細を見る
A magnetic impurity doped in a superconductor produces a localized excited statewithin the exaergy gap. This problem is studied by applying Wilson's nun'xerical renor-malization group method. The ground state and the first excited state ;tre traced bychanging the exchange coupling constaual. relative to the energy gap. Thereby the posi-lion of the localized excited state witlain tlxe energy gap is determined over the wholeregime of the magnitude of Ty,/,3 (7'.: Kondo temperature, d: superconductingenergy gap). A crossing of the lowest doublet and singlet is clearly observed atTy/A :0.3. The ferromagnetic and Ising cases have been studied also. In the fer-romaguaetic case tl?e localized excited state stays close to the gap edge since the ex-change coupling is renormalized to a weak coupling. The case of the Ising-like sdcoupling, w'hich is exactly solvable, can be used to check the c-eliability of the presentapproach and the effect of the discretization.
- 社団法人日本物理学会の論文
- 1992-09-15
著者
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SAKAI Osamu
Department of Physics, Tokyo Metropolitan University
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SHIBA Hiroyuki
Department of Physics, Kobe University
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清水 幸弘
東北大工
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Shiba Hiroyuki
Department Of Physics Tokyo Institute Of Technology
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Shimizu Yukihiro
Department of Physics, Tohoku University
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Satori Koji
Department of Physics, Tokyo Institute of Technology
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Satori Koji
Department Of Physics Tokyo Institute Of Technology
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Shimizu Yukihiro
Department Of Applied Physics Tohoku University
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Sato Hideyuki
Graduate School Of Science Tokyo Metropolitan University
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Sakai Osamu
Department Of Cardiovascular Surgery Kyoto Prefectural University Of Medicine
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Shiba Hiroyuki
Department Of Computer Science Gunma University Faculty Of Engineering
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