Suppression of the critical temperature of superconductingBa(Fe1−xCox)

High-TcSuperconductivity near the Anion Height Instability in Fe-Based Superconductors: Analysis ofLaFeAsO1−xOnari1, Yamakawa2, Kontani3 2014Phys. Rev. Lett.70101000View full textAdd to dashboardCite

“…The s ++ state is realized against the strong Coulomb repulsion due to the retardation effect, since the energy-scale of orbital fluctuations is ∼ T . The s ++ state is consistent with the robustness of T c against the randomness in Fe-pnictides [39][40][41][42][43][44]. Figure 4 (e) shows the gap functions for x = 0.14.…”

Disorder-induced topological change of the superconducting gap structure in iron pnictides

“…24). Previous studies of the T c reduction rate in iron-pnictide superconductors by chemical substitutions [25][26][27] and by particle irradiation 24,[28][29][30] focus on the comparisons with theoretical calculations for s ± and s þþ -wave superconductivity 16,31 , but they report various values of the suppression rate. Here we instead focus on changes of low-energy excitations induced by disorder from penetration depth measurements.…”

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2Cho1, Kończykowski2, Murphy3 et al. 2014Phys. Rev. B3811360View full textAdd to dashboardCite

“…Studies of the disorder introduced by chemical substitution [18][19][20], heavy-ion or particle irradiation produced results that differ significantly from each other as far as the impact on the superconducting and materials properties is concerned [21][22][23][24][25][26]. Chemical substitution changes both crystalline and electronic structure and most particle irradiations introduce correlated disorder, in forms of columnar defects and/or clusters of different spatial extent [27].…”