Enhancement of superconductivity in FeSe 1-xTe x by Li doping

Chia Ming Yang, Po Wei Chen, In Gann Chen, Xiao Ding Qi, Der Chung Yan, Maw Kuen Wu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The study investigated the chemical doping effect of Li in the Fe(Se,Te) system. With the addition of Li, the NiAs phase was precipitated, which resulted in worse superconductivity in FeSe samples. The XRD results indicated that chemical stress was found in the FeTe system which showed no superconductivity by doping Li. However, it was noticeable that the T c was increased (11.5K) and the enhancement of diamagnetic force was found in FeSe 1-xTe x (x=0.51) with 1wt% Li doping. The lattice constant of the c-axis increased with increasing content of Li, implying that the Li interstitial sites are along the c-axis. Furthermore, the XRD results showed that the enhanced superconductivity of FeSe 1-xTe x resulted from the large stress fields in FeSe 1-xTe x. The stress field effect was retarded by the large quantity of Li additives.

Original languageEnglish
Article number095010
JournalSuperconductor Science and Technology
Volume25
Issue number9
DOIs
Publication statusPublished - 2012 Sep

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

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