Superconductivity induced by Ni doping in BaFe2As2 single crystals
Superconductivity induced by Ni doping in BaFe2As2 single crystals
复制标题
BaFe2As2单晶中Ni掺杂诱导的超导
DOI：
10.1088/1367-2630/11/2/025008
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发表时间：
2009-02-27
影响因子：
3.3
通讯作者：
Xu, Z. A.
中科院分区：
文献类型：
--
作者：
Li, L. J.;Luo, Y. K.;Xu, Z. A.
用自熔法生长了122相BaFe_（2-x）Ni_xAs_（2-x）（x = 0，0.055，0.096，0.18和0.23）系列单晶，发现了Ni掺杂对超导转变温度的圆顶效应。转变温度Tc（on）在x = 0（096）时达到最大值20.5K，当x >= 0.23时降至4K以下。在正常状态下的负热电势表明，类电子的电荷载流子确实在这个系统中占主导地位。该Ni掺杂系统提供了由122相中的电子掺杂诱导的超导性的另一个例子。
A series of 122 phase BaFe2-xNixAs2 (x = 0, 0.055, 0.096, 0.18 and 0.23) single crystals was grown by the self-flux method and a dome-like Ni doping dependence of the superconducting transition temperature was discovered. The transition temperature T-c(on) reaches a maximum of 20.5K at x = 0(096, and it drops to below 4K as x >= 0.23. The negative thermopower in the normal state indicates that the electron-like charge carrier indeed dominates in this system. This Ni-doped system provides another example of superconductivity induced by electron doping in the 122 phase.