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Narrow superconducting window in LaFe_(1-x)Ni_xAsO

机译:LaFe_(1-x)Ni_xAsO中的窄超导窗口

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摘要

We have studied Ni-substitution effect in LaFe_(1-x)Ni_xAsO (0 ≤ x ≤ 0.1) by the measurements of x-ray diffraction, electrical resistivity, magnetic susceptibility, and heat capacity. The nickel doping drastically sup-presses the resistivity anomaly associated with spin-density-wave ordering in the parent compound. Supercon-rnductivity emerges in a narrow region of 0.03 ≤ x ≤ 0.06 with the maximum T_c of 6.5 K at x=0.04, wherernenhanced magnetic susceptibility shows up. The upper critical field at zero temperature is estimated to exceedrnthe Pauli paramagnetic limit. The much lowered T_c in comparison with LaFeAsO_(1-x)F_x system is discussed.
机译:我们通过测量X射线衍射,电阻率,磁化率和热容研究了LaFe_(1-x)Ni_xAsO(0≤x≤0.1)中的镍替代效应。镍掺杂极大地抑制了母体化合物中与自旋密度波排序相关的电阻率异常。超导出现在0.03≤x≤0.06的狭窄区域内,在x = 0.04时最大T_c为6.5 K,显示出增强的磁化率。估计在零温度下的上临界场超过了保利顺磁极限。讨论了与LaFeAsO_(1-x)F_x系统相比大大降低的T_c。

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