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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U2 - 10.1143/JPSJ.79.074715
DO - 10.1143/JPSJ.79.074715
M3 - Article
AN - SCOPUS:77956243327
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
M1 - 074715
ER -