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arXiv · 1405.3255

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
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Abstract

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, $\rho_0$, 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. $\rho_0$ 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.

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R. Prozorov, M. Kończykowski, M. A. Tanatar, A. Thaler, S. L. Bud'ko, P. C. Canfield, V. Mishra, P. J. Hirschfeld. 2014-05-13. Effect of electron irradiation on superconductivity in single crystals of Ba(Fe$_{1-x}$Ru$_{x}$)$_2$As$_2$ ($x=$0.24). https://doi.org/10.1103/physrevx.4.041032

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