Competition between Fe-based superconductivity and antiferromagnetism of Eu^<2+> in Eu_<1-x>Ca_xFe_2As_2
Competition between Fe-based superconductivity and antiferromagnetism of Eu^<2+> in Eu_<1-x>Ca_xFe_2As_2
复制标题
Eu_<1-x>Ca_xFe_2As_2中Eu^<2>铁基超导性与反铁磁性的竞争
DOI：
10.1088/1742-6596/273/1/012100
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
F. Ishikawa and Y. Yamada
中科院分区：
文献类型：
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作者：
A. Mitsuda;S. Seike;T. Matoba;H. Wada;F. Ishikawa and Y. Yamada
制备了Eu1-xCaxFe2As2(x=0.25，0.50和0.75)单晶。随着x的增加，Eu2+的Néel温度降低并在x=0.75时消失，而自旋密度波(SDW)的转变温度TSDW几乎不变。当x=0.50时，压力感生超导电性在20K以下出现，Eu2+的反铁磁序(AFM)对超导电性有轻微的抑制作用。与EuFe2As2相比，当x=0.50时，超导似乎克服了原子力显微镜，这是由于EuFe2+的原子力显微镜较弱(或T_N较低)所致。
Single crystals of Eu 1-x Ca x Fe 2 As 2 (x= 0.25, 0.50 and 0.75) are prepared. With increasing x, the Néel temperature of Eu 2+ decreases and disappears at x= 0.75, whereas the spin density wave (SDW) transition temperature, T SDW, is almost unchanged. For x= 0.50, the pressure-induced superconductivity emerges below 20 K and the superconductivity is slightly suppressed by the antiferromagnetic order (AFM) of Eu 2+. Compared with EuFe 2 As 2, for x= 0.50, the superconductivity seems to overcome the AFM, which is ascribed to the weaker AFM (or lower T N) of Eu 2+.