Effect of the FeSe Precursor on the Superconductivity of KxFe2−ySe2

被引：0
作者：
Ya-jing Cui
Xiao-feng Wang
Ping-yuan Li
Yong-liang Chen
Yong Zhao
机构：
[1] Southwest Jiaotong University,Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center
[2] University of New South Wales,School of Materials Science and Engineering
来源：
Journal of Superconductivity and Novel Magnetism | 2016年 / 29卷
关键词：
K; Fe; Se; Superconductivity; Iron-based superconductor; Transport properties; Magnetic properties;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Three single crystals of KxFe2−ySe2 with nominal compositions of K0.8Fe2Se2 were prepared by self-flux method in one step or two steps, employing different FeSe precursors as raw materials. Depending on the heat treatment times of FeSe precursors, these three KxFe2−ySe2 crystals are symbolized by KFeSe-0, KFeSe-1, and KFeSe-2, respectively. The onset superconducting transition temperature for KFeSe-1 and KFeSe-2 is around 44 K which is much higher than that of 34.8 K for KFeSe-0. According to the structural and transport properties, it is inferred that the higher-onset transition temperature at 44 K might be derived from another iron-rich KxFe2−ySe2 phase. The employment of FeSe precursors makes it more difficult for K ions to intercalate into FeSe layers, inducing a phase separation and the formation of a second iron-rich phase.
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页码：2771 / 2775
页数：4
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