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Inelastic neutron scattering study of iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe; Nematic effect of magnetic scattering spectra

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

Iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe have been studied by inelastic neutron scattering measurement. In contrast of FeSe, FeSe$$_{0.5}$$Te$$_{0.5}$$ exhibits temperature dependent incommensurability in magnetic spectrum with no clear structural transition. We find a jump in the incommensurability at about 70 K.



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