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arXiv 1405.3255cond-mat.supr-con
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电子辐照对Ba(Fe $_{1-x}$ Ru $_{x}$)$_2$ As $_2$($x=$ 0.24)单晶超导电性的影响

Effect of electron irradiation on superconductivity in single crystals of Ba(Fe$_{1-x}$Ru$_{x}$)$_2$As$_2$ ($x=$0.24)

R. Prozorov, M. Kończykowski, M. A. Tanatar, A. Thaler, S. L. Bud'ko, P. C. Canfield, V. Mishra, P. J. Hirschfeld

摘要:

用2.5 MeV的电子依次照射异丙基取代的Ba(Fe $_{1-x}$ Ru $_{x}$)$_2$ As $_2$($x=0.24$)的单晶,直到达到$2.1 \times 10^{19}$电子/cm ^2的最大剂量。在辐照期间在$T=$ 22 K下测量电阻率\textit{in - situ},并在随后的辐照运行之间测量作为温度的函数的\textit{ex - situ}。辐照后,超导转变温度$T_c$降低,剩余电阻率$ρ_0$增加。我们发现,电子辐照导致最快的抑制$T_c$相比,其他类型的人工引入的障碍,可能是由于强大的短程电位的点状辐照缺陷。在具有可变散射势强度的多频带场景内的更详细的分析表明,所观察到的$T_c$与$ρ_0$与$s_\pm$配对完全兼容,与先前的说法相反,该模型导致$T_c$与散射的抑制太快。

英文摘要:

A single crystal of isovalently substituted Ba(Fe$_{1-x}$Ru$_{x}$)$_2$As$_2$ ($x=0.24$) was sequentially irradiated with 2.5 MeV electrons up to a maximum dose of $2.1 \times 10^{19}$ electrons/cm^2. The electrical resistivity was measured \textit{in - situ} at $T=$22 K during the irradiation and \textit{ex - situ} as a function of temperature between subsequent irradiation runs. Upon irradiation, the superconducting transition temperature, $T_c$, decreases and the residual resistivity, $ρ_0$, increases. We find that electron irradiation leads to the fastest suppression of $T_c$ compared to other types of artificially introduced disorder, probably due to the strong short-range potential of the point-like irradiation defects. A more detailed analysis within a multiband scenario with variable scattering potential strength shows that the observed $T_c$ vs. $ρ_0$ is fully compatible with $s_\pm$ pairing, in contrast to earlier claims that this model leads to a too rapid a suppression of $T_c$ with scattering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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