Neutron scattering of iron-based superconductors |
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| Authors: | S Shamoto S Wakimoto K Kodama M Ishikado AD Christianson MD Lumsden R Kajimoto M Nakamura Y Inamura M Arai K Kakurai F Esaka A Iyo H Kito H Eisaki |
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| Institution: | 1. Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;2. JST-TRIP, Tokyo 102-0075, Japan;3. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;4. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;5. Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;6. Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | Low-energy spin excitations have been studied on polycrystalline LaFeAsO1?xFx samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x = 0.158, where the superconducting transition temperature Tc is suppressed to 7 K. In addition, χ″(ω) in optimally doped LaFeAsO0.918F0.082 with Tc = 29 K exhibits a spin resonance mode. The peak energy, Eres, when scaled by kBTc is similar to the value of about 4.7 reported in other high-Tc iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-Tc superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the Γ and M points. |
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