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Nematic effect on spin excitations of FeSe$$_{0.5}$$Te$$_{0.5}$$5 and FeSe

Shamoto, Shinichi  ; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Kodama, Katsuaki  ; Kajimoto, Ryoichi  ; Nakamura, Mitsutaka  ; Shibauchi, Takasada*; Matsuda, Yuji*; Arai, Masatoshi*

Iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe have been studied by inelastic neutron scattering measurement. Although FeSe$$_{0.5}$$Te$$_{0.5}$$ does not exhibit any clear structural transition, the incommensurate magnetic excitation shows a jump at about 70 K in the incommensurability. It may suggest that the degeneracy of d$$_{zx}$$ and d$$_{yz}$$ orbitals in FeSe$$_{0.5}$$Te$$_{0.5}$$ is lifted in this temperature range. It can be due to the nematic effect even in FeSe$$_{0.5}$$Te$$_{0.5}$$.



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