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Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors

電子ドープ鉄プニクタイド超伝導体における軌道内スピン励起の変化

飯村 壮史*; 松石 聡*; 宮川 仁*; 谷口 尚*; 鈴木 雄大*; 臼井 秀知*; 黒木 和彦*; 梶本 亮一 ; 中村 充孝; 稲村 泰弘; 池内 和彦*; Ji, S.*; 細野 秀雄*

Iimura, Soshi*; Matsuishi, Satoru*; Miyakawa, Masashi*; Taniguchi, Takashi*; Suzuki, Katsuhiro*; Usui, Hidetomo*; Kuroki, Kazuhiko*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Ikeuchi, Kazuhiko*; Ji, S.*; Hosono, Hideo*

We investigate the doping dependence of the magnetic excitations in two-superconducting-dome-system LaFeAsO$$_{1-x}$$D$$_{x}$$. Using inelastic neutron scattering, spin fluctuations at different wavenumbers were observed under both superconducting domes around $$x = 0.1$$ and 0.4, but vanished at $$x = 0.2$$ corresponding to the $$T_c$$ valley. Theoretical calculations indicate that the characteristic doping dependence of spin fluctuations is rationally explained as a consequence of the switching of the two intra-orbital nestings within Fe-3$$d_{YZ, ZX}$$ and 3$$d_{X^2-Y^2}$$ by electron doping. The present results imply that the multi-orbital nature plays an important role in the doping and/or material dependence of the $$T_{c}$$ of the iron pnictide superconductors.

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パーセンタイル:25.75

分野:Materials Science, Multidisciplinary

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