Single-Impurity Problem in Iron-Pnictide Superconductors
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概要
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The single-impurity problem in iron-pnictide superconductors is investigated by solving the Bogoliubov–de Gennes (BdG) equation in a microscopic multiorbital model. We construct a five-orbital model suitable for the BdG analysis, which reproduces the results of random phase approximation in a uniform case. Using this model, we study the local density of states around a nonmagnetic impurity and discuss the bound-state peak structure, which can be used for distinguishing the s+- and s++ states. A bound state with nearly zero energy is found in the case of the impurity potential $I\sim 1.0$ eV, while the bound-state peaks stick to the gap edge in the unitary limit $|I|\rightarrow \infty$. A novel multiple-peak structure originating from the multiorbital nature of iron pnictides is also found.
- 2010-08-15
著者
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Kariyado Toshikaze
Department Of Physics University Of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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Masao Ogata
Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
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