Tellurium substitution effect on superconductivity of theα-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-Lian Chen; Jiu-Yong Luo; Der-Chung Yan; Maw-Kuen Wu

doi:10.1209/0295-5075/84/37002

All issues

Volume 84 / No 3 (November 2008)

EPL, 84 3 (2008) 37002

Abstract

Issue		EPL Volume 84, Number 3, November 2008


Article Number		37002
Number of page(s)		4
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/84/37002
Published online		17 October 2008

EPL, 84 (2008) 37002

Tellurium substitution effect on superconductivity of theα-phase iron selenide

Kuo-Wei Yeh¹, Tzu-Wen Huang¹, Yi-lin Huang¹, Ta-Kun Chen¹, Fong-Chi Hsu¹^,2, Phillip M. Wu³, Yong-Chi Lee¹, Yan-Yi Chu¹^,2, Chi-Lian Chen¹, Jiu-Yong Luo¹, Der-Chung Yan¹ and Maw-Kuen Wu¹

¹ 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: mkwu@phys.sinica.edu.tw

Received: 6 August 2008
Accepted: 15 September 2008

Abstract

We have carried out a systematic study of the PbO-type compound FeSe $_{1-x}$ Te_x (x = 0 – 1), where the Te substitution effect on superconductivity is investigated. It is found that the superconducting transition temperature reaches a maximum of T_c=15.2 K at about 50% Te substitution. The pressure-enhanced T_c of FeSe_0.5Te_0.5 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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