1. Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
- Author
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Yeh, Kuo-Wei, Huang, Tzu-Wen, Huang, Yi-Lin, Chen, Ta-Kun, Hsu, Fong-Chi, Wu, Phillip M., Lee, Yong-Chi, Chu, Yan-Yi, Chen, Chi-Liang, Luo, Jiu-Yong, Yan, Der-Chung, and Wu, Maw-Kuen
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
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., Comment: Some typing errors are corrected; we take out one figures, now the paper has 14 pages, 5 figures
- Published
- 2008
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