Modulated superconductivity due to vacancy and magnetic order inAyFe2−x/2Se2[A=Cs, K, (Tl,Rb), (Tl,K)] iron-selenide superconductors (original) (raw)

Modulated superconductivity is explored in iron-selenide superconductors A x Fe 2−x/2 Se 2 [A=Cs, K, (Tl,Rb), (Tl,K)], focusing on the role of Fe vacancies and their ordered states. The research highlights how the formation of a specific incommensurate vacancy order induces block checkerboard antiferromagnetic phases, leading to a reconstructed ground state that coexists with d-wave superconductivity. This interaction enhances superconductivity, suggesting a need to reconsider traditional phase separation models in high-temperature superconductors.