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 $_{0.5}$ .

Language	:	English
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Meeting title	:	2015 EMN Qingdao Meeting
Held date	:	2015/06
Location (city)	:	Qingdao
Location (country)	:	China
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Keywords	:	鉄系超伝導体; 中性子散乱
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : BB20150328
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Nematic effect on spin excitations of FeSeTe5 and FeSe

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