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Tellurium substitution effect on superconductivity of the α-phase iron selenide
Europhysics Letters (EPL) · 2008 · Vol. 84(3) · pp. 37002–37002
K. C. Yeh✉(Institute of Physics, Academia Sinica)Tzu-Wen Huang(Institute of Physics, Academia Sinica)Yi‐Lin Huang(Institute of Physics, Academia Sinica)Ta-Kun Chen(Institute of Physics, Academia Sinica)Fong-Chi Hsu(Institute of Physics, Academia Sinica)Phillip M. Wu(Duke University)Yong-Chi Lee(Institute of Physics, Academia Sinica)Yan-Yi Chu(National Tsing Hua University)Chi‐Liang Chen(Institute of Physics, Academia Sinica)Jiu-Yong Luo(Institute of Physics, Academia Sinica)Der-Chung Yan(Institute of Physics, Academia Sinica)Maw‐Kuen Wu(Institute of Physics, Academia Sinica)
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.
Iron-based superconductors researchRare-earth and actinide compoundsSelenideSubstitution (logic)SuperconductivityTelluriumPhase (matter)ChemistryMaterials scienceCondensed matter physicsSeleniumInorganic chemistry
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References
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