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arXiv 1205.4485cond-mat.supr-con
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3d金属(Co和Ni)掺杂对FeSe0.5Te 0.5超导电性的影响

Effect of 3d Metal (Co and Ni) Doping on the Superconductivity of FeSe0.5Te0.5

Anuj Kumar, R. P. Tandon, V. P. S. Awana

摘要:

我们报道了3d金属Co和Ni掺杂对FeTe_(0.5)Se_(0.5)超导体的影响,其标称成分范围为Fe_(1-x)MxTe_(0.5)Se_(0.5)(M = Co,Ni,x = 0.00,0.01,0.02,0.05和0.10)。样品均采用标准固相反应路线合成,均为单相四方晶系,空间群为P4 nmm。晶格常数'a'、'c'和体积随Co和Ni含量的增加而减小,但不是单调的。事实上,Co掺杂样品的“a”晶格参数对于Co掺杂样品几乎不受影响。超导转变温度(Tc)是从直流和交流磁化率测量的,随着Ni或Co含量的增加而降低。Co和Ni都抑制Tc,使体系进入正常状态。有趣的是,Ni抑制超导性比Co快得多。这表明在面内Fe-Se距离的影响较小,从而减少了在Co的情况下,当与Ni变电站在Fe站点FeTe0.5Se0.5超导体。结果表明,FeTe_(0.5)Se_(0.5)超导体中Fe-Se和Fe-Se-Se超导面的面内无序直接影响其超导电性。

英文摘要:

We report the effect of 3d metal Cobalt (Co) and Nickel (Ni) doping on the FeTe0.5Se0.5 superconductor with the nominal composition range Fe1-xMxTe0.5Se0.5 (M = Co, Ni and x = 0.00, 0.01 0.02, 0.05, and 0.10). Samples are synthesized through standard solid state reaction route and all are crystallize in single phase tetragonal structure with space group P4nmm. The lattice parameters 'a', 'c' and volume decrease with increase in Co and Ni content, although not monotonically. In fact the 'a' lattice parameter of Co doped samples is nearly unaffected for Co doped samples. The superconducting transition temperature (Tc) is measured from both DC and AC magnetic susceptibility, which decrease with increase in Ni or Co content. Both Co and Ni suppress Tc and drive the system into the normal state. Interestingly, Ni suppresses the superconductivity much faster than the Co. This indicates less effect on in-plane Fe-Se distances and thus reduced disorder in case of Co when compared with Ni substation at Fe site in FeTe0.5Se0.5 superconductor. It is concluded that in-plane disorder on superconducting Fe-Se and Fe-Se-Se planes directly affects superconductivity in FeTe0.5Se0.5 superconductor.

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