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

被引：25

作者：

Iimura, Soshi ^{[1
]}

Matsuishi, Satoru ^{[2
]}

Miyakawa, Masashi ^{[3
]}

Taniguchi, Takashi ^{[4
]}

Suzuki, Katsuhiro ^{[5
]}

Usui, Hidetomo ^{[5
]}

Kuroki, Kazuhiko ^{[6
]}

Kajimoto, Ryoichi ^{[7
]}

Nakamura, Mitsutaka ^{[8
]}

Inamura, Yasuhiro ^{[8
]}

Ikeuchi, Kazuhiko ^{[7
]}

Ji, Sungdae ^{[7
]}

Hosono, Hideo ^{[1
,9
]}

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Mat Res Ctr Element Strategy, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[3] Natl Inst Mat Sci, Superconducting Properties Unit, Tsukuba, Ibaraki 3050044, Japan

[4] Natl Inst Mat Sci, Mat Proc Unit, Tsukuba, Ibaraki 3050044, Japan

[5] Univ Electrocommun, Dept Engn Sci, Tokyo 1828585, Japan

[6] Osaka Univ, Dept Phys, Osaka 5600043, Japan

[7] CROSS, Res Ctr Neutron Sci & Technol, Ibaraki 3191106, Japan

[8] Japan Atom Energy Agcy, J PARC Ctr, Ibaraki 3191195, Japan

[9] Tokyo Inst Technol, Frontier Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 06期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevB.88.060501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the doping dependence of the magnetic excitations in the two-superconducting-dome system LaFeAsO1-xDx. Using inelastic neutron scattering, spin fluctuations at different wave numbers 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 the spin fluctuations is rationally explained as a consequence of the switching of the two intra-orbital nestings within Fe-3d(YZ, ZX) and Fe-3d(X2-Y2) by electron doping. The present results imply that the multiorbital nature plays an important role in the doping and/or material dependence of the T-c of the iron pnictide superconductors.

引用

页数：5

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