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
TL;DR
This study systematically investigates how substituting tellurium in FeSe affects its superconductivity, revealing a maximum Tc at 50% Te, pressure effects, and structural changes influencing superconductivity.
Contribution
It provides new insights into the Te substitution effects on FeSe's superconductivity and the structural transitions impacting magnetic and superconducting properties.
Findings
Maximum Tc of 15.2K at 50% Te substitution
Pressure increases Tc significantly in FeSe0.5Te0.5
FeTe loses superconductivity due to structural distortion
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.
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