超导铁基化合物（A1-xSrx）Fe2As2，其中A = K和Cs，转变温度高达37K。
Superconducting Fe-based compounds (A1-xSrx)Fe2As2 with A=K and Cs with transition temperatures up to 37 K.
作者信息
Sasmal Kalyan, Lv Bing, Lorenz Bernd, Guloy Arnold M, Chen Feng, Xue Yu-Yi, Chu Ching-Wu
机构信息
TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA.
出版信息
Phys Rev Lett. 2008 Sep 5;101(10):107007. doi: 10.1103/PhysRevLett.101.107007.
New high-T{c} Fe-based superconducting compounds, AFe2As2 with A=K, Cs, K/Sr, and Cs/Sr, were synthesized. The T{c} of KFe2As2 and CsFe2As2 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 (Fe2As2) 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}.
合成了新的高温超导铁基化合物AFe₂As₂，其中A = K、Cs、K/Sr和Cs/Sr。KFe₂As₂和CsFe₂As₂的超导转变温度Tc分别为3.8 K和2.6 K，随着K和Cs被Sr部分取代，Tc升高，在Sr取代量为50%-60%时达到峰值37 K，并且随着电子数（Sr含量）增加，这些化合物进入自旋密度波状态。这些化合物代表了n型掺杂稀土氧氮化物超导体的p型类似物。它们的电子和结构行为表明(Fe₂As₂)层在铁基层状体系超导性中起着关键作用，并且具有元素A层这一特性为实现更高转变温度的超导性提供了新途径。
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