Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO1-xFx

Shuichi Wakimoto; Katsuaki Kodama; Motoyuki Ishikado; Masaaki Matsuda; Ryoichi Kajimoto; Masatoshi Arai; Kazuhisa Kakurai; Fumitaka Esaka; Akira Iyo; Hijiri Kito; Hiroshi Eisaki; Shin Ichi Shamoto

doi:10.1143/JPSJ.79.074715

Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO_1-xF_x

Shuichi Wakimoto, Katsuaki Kodama, Motoyuki Ishikado, Masaaki Matsuda, Ryoichi Kajimoto, Masatoshi Arai, Kazuhisa Kakurai, Fumitaka Esaka, Akira Iyo, Hijiri Kito, Hiroshi Eisaki, Shin Ichi Shamoto

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAs-O_1-xF_x by inelastic neutron scattering up to an energy transfer of ω = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, T_c = 25K and x = 0.082, T_c = 29 K) show a dynamical spin susceptibility χ"(ω) comparable to that of the parent samples. However, χ"(ω) 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.

Original language	English
Article number	074715
Journal	Journal of the Physical Society of Japan
Volume	79
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.79.074715
Publication status	Published - 2010 Jul

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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Wakimoto, Shuichi ; Kodama, Katsuaki ; Ishikado, Motoyuki ; Matsuda, Masaaki ; Kajimoto, Ryoichi ; Arai, Masatoshi ; Kakurai, Kazuhisa ; Esaka, Fumitaka ; Iyo, Akira ; Kito, Hijiri ; Eisaki, Hiroshi ; Shamoto, Shin Ichi. / Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO_1-xF_x. In: Journal of the Physical Society of Japan. 2010 ; Vol. 79, No. 7.

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title = "Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO1-xFx",

abstract = "Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAs-O1-xFx by inelastic neutron scattering up to an energy transfer of ω = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, Tc = 25K and x = 0.082, Tc = 29 K) show a dynamical spin susceptibility χ{"}(ω) comparable to that of the parent samples. However, χ{"}(ω) 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.",

author = "Shuichi Wakimoto and Katsuaki Kodama and Motoyuki Ishikado and Masaaki Matsuda and Ryoichi Kajimoto and Masatoshi Arai and Kazuhisa Kakurai and Fumitaka Esaka and Akira Iyo and Hijiri Kito and Hiroshi Eisaki and Shamoto, {Shin Ichi}",

year = "2010",

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doi = "10.1143/JPSJ.79.074715",

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Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO_1-xF_x. / Wakimoto, Shuichi; Kodama, Katsuaki; Ishikado, Motoyuki; Matsuda, Masaaki; Kajimoto, Ryoichi; Arai, Masatoshi; Kakurai, Kazuhisa; Esaka, Fumitaka; Iyo, Akira; Kito, Hijiri; Eisaki, Hiroshi; Shamoto, Shin Ichi.

In: Journal of the Physical Society of Japan, Vol. 79, No. 7, 074715, 07.2010.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO1-xFx

AU - Wakimoto, Shuichi

AU - Kodama, Katsuaki

AU - Ishikado, Motoyuki

AU - Matsuda, Masaaki

AU - Kajimoto, Ryoichi

AU - Arai, Masatoshi

AU - Kakurai, Kazuhisa

AU - Esaka, Fumitaka

AU - Iyo, Akira

AU - Kito, Hijiri

AU - Eisaki, Hiroshi

AU - Shamoto, Shin Ichi

PY - 2010/7

Y1 - 2010/7

N2 - Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAs-O1-xFx by inelastic neutron scattering up to an energy transfer of ω = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, Tc = 25K and x = 0.082, Tc = 29 K) show a dynamical spin susceptibility χ"(ω) comparable to that of the parent samples. However, χ"(ω) 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.

AB - Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAs-O1-xFx by inelastic neutron scattering up to an energy transfer of ω = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, Tc = 25K and x = 0.082, Tc = 29 K) show a dynamical spin susceptibility χ"(ω) comparable to that of the parent samples. However, χ"(ω) 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.

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