Neutron-irradiation effects in LaO0.9F0.1FeAs superconductor

Abstract

The effect of atomic disorder induced by neutrons irradiation on superconducting and normal state properties of polycrystalline LaFeAsO_0.9F_0.1 was investigated. The irradiation of the sample by a moderate neutron fluence F = 1.6*1019 cm^-2 at Tirr = 50 +- 10 C leads to the suppression of superconductivity which recovers almost completely after annealing at temperatures Tann < 750 C. It is shown that the reduction of superconducting transition temperature Tc under atomic disordering is not determined solely by the value of Hall concentration nH, i.e. doping level, but is governed by the reduction of electronic relaxation time. This behavior can be described qualitatively by universal Abrikosov-Gorkov equation which presents evidence on the anomalous type of electrons pairing in Fe-based superconductors.

8 pages, 11 figures

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• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Anisotropic critical currents in FeSe0.5Te0.5 films and the influence of neutron irradiation
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• Impurity effect and suppression to superconductivity in Na(Fe${}_{0.97-x}$Co${}_{0.03}$T${}_x$)As (T=Cu, Mn)
• Effect of $\alpha$-particle irradiation on a NdFeAs(O,F) thin film
• Thermodynamics of $s_{\pm }-to-s_{++}$ transition in iron pnictides in the vicinity of the Born limit