Figure 2: Effect of electron irradiation on the superconducting transition in BaFe2(As1−xPx)2 single crystals.
From: Disorder-induced topological change of the superconducting gap structure in iron pnictides
(a) Temperature dependence of the TDO frequency shift normalized by the total shift during the superconducting transitions for crystals (#28A and #28B) from a batch of Tc0=28 K with irradiated doses of 0, 1.0, 2.0, 4.0 and 6.0 C cm−2 with decreasing Tc. (b) Similar plot for crystals (#29A, #29B, #29C, #29D and #29E) from a batch of Tc0=29 K with irradiated doses of 0, 1.5, 2.7, 4.7, 4.9 and 8.3 C cm−2 with decreasing Tc. (c) Temperature dependence of resistivity for a crystal (#30A) with Tc0=30 K with irradiated doses of 0, 1.1, 2.3, 3.8 and 4.5 C cm−2 with decreasing Tc. Dotted lines are linear extrapolations to zero temperature to estimate changes in residual resistivity Δρ0. (d) Transition temperature Tc normalized by the pristine value Tc0=30 K as a function of Δρ0, determined by the resistivity measurements in crystal #30A.
