Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO1-xFx

被引：49

作者：

Wakimoto, Shuichi ^{[1
,2
]}

Kodama, Katsuaki ^{[1
,2
]}

Ishikado, Motoyuki ^{[1
,2
]}

Matsuda, Masaaki ^{[1
,2
]}

Kajimoto, Ryoichi ^{[2
,3
]}

Arai, Masatoshi ^{[2
,3
]}

Kakurai, Kazuhisa ^{[1
,2
]}

Esaka, Fumitaka ^{[4
]}

Iyo, Akira ^{[2
,5
]}

Kito, Hijiri ^{[2
,5
]}

Eisaki, Hiroshi ^{[2
,5
]}

Shamoto, Shin-ichi ^{[1
,2
]}

机构：

[1] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

[2] Transformat Res Project Iron Pnictides TRIP, JST, Tokyo 1020075, Japan

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

[4] Japan Atom Energy Agcy, Nucl Sci & Engn Directorate, Tokai, Ibaraki 3191195, Japan

[5] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki 3058562, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 07期

关键词：

superconductivity; spin fluctuation; inelastic neutron scattering; iron pnictide superconductor; LaFeAsO1-xFx;

D O I：

10.1143/JPSJ.79.074715

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAsO1 F-x(x) by inelastic neutron scattering up to an energy transfer of omega = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, T-c = 25 K and x = 0.082, T-c = 29 K) show a dynamical spin susceptibility chi ''(omega) comparable to that of the parent samples. However, chi ''(omega) almost vanishes in the x = 0.158 sample, in which the superconductivity is highly suppressed. These results are compatible with the theoretical suggestions that spin fluctuation plays an important role in superconductivity.

引用

页数：4

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