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Resonant spin excitation on iron-based superconductor BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Nagai, Yuki  ; Kodama, Katsuaki  ; Kajimoto, Ryoichi  ; Nakamura, Mitsutaka  ; Inamura, Yasuhiro; Wakimoto, Shuichi ; Nakamura, Hiroki ; Machida, Masahiko ; Suzuki, Katsuhiro*; Usui, Hidetomo*; Kuroki, Kazuhiko*; Iyo, Akira*; Eisaki, Hiroshi*; Arai, Masatoshi; Shamoto, Shinichi  

In this study, we have performed inelastic neutron scattering measurement on 36g powder sample of optimally-doped BaFe$$_2$$(As,P)$$_2$$ whose superconducting order parameter is expected to have line node by Fermi chopper spectrometer 4SEASONS in J-PARC. Unexpectedly, we have observed spin resonance at same $$Q$$-position and nearly identical resonance enhancement ration to other iron-based superconducctors with fully-gapped $$s_{+-}$$-wave. We will discuss about the possible superconducting gap symmetry based on our experimental results.



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