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

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

2008-08-04

arxiv.org/abs/0808.0474v2

Physics

Condensed Matter

Superconductivity

Some typing errors are corrected; we take out one figures, now the paper has 14 pages, 5 figures

Scientific paper

10.1209/0295-5075/84/37002

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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