期刊
EPL
卷 94, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/94/27009
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资金
- Nature Science Foundation of China [10974175, 10934005]
- National Basic Research Program of China (973 Program) [2011CBA00103, 2009CB929104]
- Ministry of Education of China [IRT0754]
(Tl,K)FexSe2 single crystals were first successfully synthesized with the Bridgeman method. The physical properties are characterized by electrical resistivity, magnetic susceptibility and Hall coefficient. We found that the (Tl,K)FexSe2 (1.30 <= x <= 1.65) compounds show an antiferromagetic (AFM) insulator behavior, which may be associated with the Fe-vacancy ordering in the crystals. While in the 1.70 <= x < 1.78 crystals, superconductivity (SC) coexists with an insulating phase. As Fe content further increases, the bulk SC with T-c = 31K (and a T-c(onset) as high as 40 K) appears in the 1.78 <= x <= 1.88 crystals. Our discovery represents the first Fe-based high-temperature superconductivity (HTSC) at the verge of an AFM insulator. Copyright (C) EPLA, 2011
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