期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.107007
关键词
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资金
- NSF [CHE0616805]
- R. A. Welch Foundation
New high-T(c) Fe-based superconducting compounds, AFe(2)As(2) with A=K, Cs, K/Sr, and Cs/Sr, were synthesized. The T(c) of KFe(2)As(2) and CsFe(2)As(2) is 3.8 and 2.6 K, respectively, which rises with partial substitution of Sr for K and Cs and peaks at 37 K for 50%-60% Sr substitution, and the compounds enter a spin-density-wave state with increasing electron number (Sr content). The compounds represent p-type analogs of the n-doped rare-earth oxypnictide superconductors. Their electronic and structural behavior demonstrate the crucial role of the (Fe(2)As(2)) layers in the superconductivity of the Fe-based layered systems, and the special feature of having elemental A layers provides new avenues to superconductivity at higher T(c).
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