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

doi:10.1088/0953-2048/25/9/095010

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 journal › Article › peer-review

14 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 language	English
Article number	095010
Journal	Superconductor Science and Technology
Volume	25
Issue number	9
DOIs	https://doi.org/10.1088/0953-2048/25/9/095010
Publication status	Published - 2012 Sept

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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10.1088/0953-2048/25/9/095010

Cite this

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title = "Enhancement of superconductivity in FeSe 1-xTe x by Li doping",

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.",

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AU - Yang, Chia Ming

AU - Chen, Po Wei

AU - Chen, In Gann

AU - Qi, Xiao Ding

AU - Yan, Der Chung

AU - Wu, Maw Kuen

PY - 2012/9

Y1 - 2012/9

N2 - 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.

AB - 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.

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

Abstract

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