Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO1-xFx
スポンサーリンク
概要
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Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAsO1-xFx by inelastic neutron scattering up to an energy transfer of $\omega = 15$ meV using polycrystalline samples. Superconducting samples ($x=0.057$, $T_{\text{c}}=25$ K and $x=0.082$, $T_{\text{c}}=29$ 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.
- 2010-07-15
著者
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IYO Akira
JST, TRIP
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EISAKI Hiroshi
JST, TRIP
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Kodama Katsuaki
Quantum Beam Directorate Japan Atomic Energy Agency
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Kakurai Kazuhisa
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Matsuda Masaaki
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Wakimoto Shuichi
Quantum Beam Science Directorate Japan Atomic Energy Agency
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SHAMOTO Shin-ichi
Quantum Beam Directorate, Japan Atomic Energy Agency
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Esaka Fumitaka
Nuclear Science And Engineering Directorate Japan Atomic Energy Agency
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Kito Hijiri
JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan
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Arai Masatoshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan
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Ishikado Motoyuki
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Kajimoto Ryoichi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan
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Iyo Akira
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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Eisaki Hiroshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
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Eisaki Hiroshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan
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Wakimoto Shuichi
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Esaka Fumitaka
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Eisaki Hiroshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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