Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 79, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.074715
Keywords
superconductivity; spin fluctuation; inelastic neutron scattering; iron pnictide superconductor; LaFeAsO1-xFx
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [17001001]
- Grants-in-Aid for Scientific Research [22604007] Funding Source: KAKEN
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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.
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