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.
Original language | English |
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Article number | 074715 |
Journal | Journal of the Physical Society of Japan |
Volume | 79 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2010 |
Externally published | Yes |
Funding
Keywords
- Inelastic neutron scattering
- Iron pnictide superconductor
- LaFeAsOF
- Spin fluctuation
- Superconductivity