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We have carried out a systematic study of the PbO-type compound FeSe₁-ₗTeₓ (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.
Yeh et al. (Mon,) studied this question.