Inelastic neutron scattering on iron-based superconductor BaFe2(As,P)2 |
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| Authors: | M. Ishikado K. Kodama R. Kajimoto M. Nakamura Y. Inamura S. Wakimoto A. Iyo H. Eisaki M. Arai S. Shamoto |
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| Affiliation: | 1. Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;2. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;3. Nanoelectronic Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan;4. JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | Inelastic neutron scattering has been performed on powder sample of an iron-based superconductor BaFe2(As0.65P0.35)2 with superconducting transition temperature (Tc) = 30 K, whose superconducting (SC) order parameter is expected to have line node. In the normal state, constant-E scan of dynamical structure factor, S(Q, E), exhibits a peak structure centered at momentum transfer Q ～ 1.20 Å?1, corresponding to antiferromagnetic wave vector. Below Tc, the redistribution of the magnetic spectral weight takes place, resulting in the formation of a peak at E ～ 12 meV and a gap below 6 meV. The enhanced magnetic peak structure is ascribed to the spin resonance mode, evidencing sign change in the SC order parameter similar to other iron-based high-Tc superconductors. It suggests that fully-gapped s± symmetry dominates in this superconductor, which gives rise to high-Tc (=30 K) despite the nodal symmetry. |
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