Nematic effect on spin excitations of FeSeTe5 and FeSe

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

no journal, , 

Iron-based superconductors FeSeTe and FeSe have been studied by inelastic neutron scattering measurement. Although FeSeTe 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 and d orbitals in FeSeTe is lifted in this temperature range. It can be due to the nematic effect even in FeSeTe.