Neutron-irradiation effects in polycrystalline LaFeAsO0.9F0.1 superconductors

A. E. Karkin; J. Werner; G. Behr; B. N. Goshchitskii

doi:10.1103/PhysRevB.80.174512

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Neutron-irradiation effects in polycrystalline LaFeAsO0.9F0.1 superconductors

A. E. Karkin, J. Werner, G. Behr, B. N. Goshchitskii

DOI 10.1103/PhysRevB.80.174512 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown