Volume 84, Number 3, November 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 October 2008|
Tellurium substitution effect on superconductivity of theα-phase iron selenide
Institute of Physics, Academia Sinica - Nankang, Taipei, Taiwan
2 Department of Materials Science and Engineering, National Tsing Hua University - Hsinchu, Taiwan
3 Department of Physics, Duke University - Durham, NC, USA
Corresponding author: firstname.lastname@example.org
Accepted: 15 September 2008
We have carried out a systematic study of the PbO-type compound FeSeTex (x = 0 – 1), where the Te substitution effect on superconductivity is investigated. It is found that the superconducting transition temperature reaches a maximum of Tc=15.2 K 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.
PACS: 74.62.Dh – Effects of crystal defects, doping and substitution / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.62.Fj – Pressure effects
© EPLA, 2008
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