Phys. Rev. B 80, 174512 (2009) [6 pages]Neutron-irradiation effects in polycrystalline LaFeAsO0.9F0.1 superconductorsReceived 20 July 2009; revised 8 October 2009; published 11 November 2009 The effect of atomic disordering induced by fast neutron irradiation on normal and superconducting state properties of polycrystalline LaFeAsO0.9F0.1 samples was investigated. Fast neutron (E>0.1 MeV) irradiation to a “moderate” fluence Φ=1.6×1019 cm−2 at Tirr=50±10 °C leads to a complete suppression of superconductivity which recovers almost completely after annealing at Tann≤750 °C. It is shown that decrease of Tc under disordering is determined mainly by reduction in electronic relaxation time τ. Such behavior is qualitatively described by the universal Abrikosov-Gor’kov equation, which testifies to an anomalous type of electron pairing in Fe-based superconductors. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.174512
DOI:
10.1103/PhysRevB.80.174512
PACS:
74.62.Dh, 72.15.Gd
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