$^{57}$ Fe nuclear resonant inelastic scattering of iron based superconductor, FeTeSe $_{1-x}$

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

FeTeSe $_{1-x}$ consists of only the superconducting layer of iron and chalcogenides and is one of the simplest iron-based superconductor. We measured the nuclear resonant inelastic scattering by $^{57}$ Fe in FeTe $_{0.5}$ Se $_{0.5}$ and FeTe $_{0.9}$ , to observe the temperature dependence of their phonon density of states (PDOS); FeTe $_{0.5}$ Se $_{0.5}$ has the highest superconducting temperature (T) among FeTeSe $_{1-x}$ and the non-superconducting FeTe $_{0.9}$ is the base material of FeTeSe $_{1-x}$ . The difference between the PDOS of FeTe $_{0.5}$ Se $_{0.5}$ at temperatures below and above T is unclear. This indicates the phonons are not the main contribution to the superconductivity. On the other hand, the PDOS of FeTe $_{0.9}$ changes depending on temperature and this change is understood by the results of the structural phase transition.

Language	:	English
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Meeting title	:	31st International Conference on the Applications of the Mssbauer Effect (ICAME 2011)
Held date	:	2011/09
Location (city)	:	Kobe
Location (country)	:	Japan
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Keywords	:	no keyword
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Registration No. : BB20112214
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