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Inelastic neutron scattering on iron-based superconductor BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Kodama, Katsuaki   ; Kajimoto, Ryoichi  ; Nakamura, Mitsutaka   ; Inamura, Yasuhiro; Wakimoto, Shuichi  ; Iyo, Akira*; Eisaki, Hiroshi*; Arai, Masatoshi; Shamoto, Shinichi  

Superconducting gap symmetry of $$Ln$$1111 system, which has the highest $$T_c$$ in iron-based superconductors, is considered to be full gap $$s_{pm}$$ wave based on magnetic penetration depth and neutron scattering measurements. On the other hand, a line node gap symmetry is proposed in BaFe$$_2$$(As,P)$$_2$$ based on magnetic penetration depth and thermal conductivity measurements despite comparatively its high-$$T_c$$ ($$T_c$$=30 K). Inelastic neutron scattering of BaFe$$_2$$(As,P)$$_2$$ may exhibit different magnetic excitations in the $$Q$$-position or $$E$$-dependence of a resonant peak from that of La1111 system. In this study, we performed inelastic neutron scattering measurement on 36g polycrystalline powder sample of optimally-doped BaFe$$_2$$(As,P)$$_2$$ using Fermi chopper spectrometer 4SEASONS in J-PARC. We will discuss about the possible superconducting gap symmetry based on our inelastic neutron scattering results.

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Category:Physics, Applied

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