Robust Spin Fluctuations and s\pm Pairing in the Heavily Electron Doped Iron-Based Superconductors
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概要
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We theoretically study the spin fluctuation and superconductivity in La1111 and Sm1111 iron-based superconductors for a wide range of electron doping. When we take into account the band structure variation by electron doping, the hole Fermi surface originating from the d_{X^{2}-Y^{2}} orbital turns out to be robust against electron doping, and this gives rise to large spin fluctuations and consequently s\pm pairing even in the heavily doped regime. The stable hole Fermi surface is larger for Sm1111 than for La1111, which can be considered as the origin of the apparent difference in the phase diagram.
- 2013-08-15
著者
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Hosono Hideo
Frontier Collaborative Research Center Tokyo Institute Of Technology
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Usui Hidetomo
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Kuroki Kazuhiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Suzuki Katsuhiro
Department Of Agricultural Chemistry Yamagata University:(present Office)ageo Research Laboratory Ni
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Matsuishi Satoru
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Iimura Soshi
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Sato Yoshiyasu
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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