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arXiv 0808.0474cond-mat.supr-concond-mat.str-el
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碲替代对α相硒化铁超导电性的影响

Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide

Kuo-Wei Yeh, Tzu-Wen Huang, Yi-Lin Huang, Ta-Kun Chen, Fong-Chi Hsu, Phillip M. Wu, Yong-Chi Lee, Yan-Yi Chu, Chi-Liang Chen, Jiu-Yong Luo, Der-Chung Yan, Maw-Kuen Wu

摘要:

我们对PbO型化合物FeSe_{1-x} Te_x(x = 0~1)进行了系统的研究,探讨了Te的替代对超导电性的影响。结果表明,当Te掺杂量为50%时,超导转变温度达到最大值Tc=15.2K。FeSe_(0.5)Te_(0.5)的压力增强T_c比FeSe的压力增强T_c大10倍以上。有趣的是,FeTe不再是超导体。低温结构畸变使FeTe从三斜对称转变为正交对称。我们认为,这种结构的变化打破了磁对称性,抑制了FeTe的超导电性。

英文摘要:

We have carried out a systematic study of the PbO-type compound FeSe_{1-x}Te_x (x = 0~1), where Te substitution effect on superconductivity is investigated. It is found that superconducting transition temperature reaches a maximum of Tc=15.2K at about 50% Te substitution. The pressure-enhanced Tc of FeSe0.5Te0.5 is more than 10 times larger than that of FeSe. Interestingly, FeTe is no longer superconducting. A low temperature structural distortion changes FeTe from triclinic symmetry to orthorhombic symmetry. We believe that this structural change breaks the magnetic symmetry and suppresses superconductivity in FeTe.

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