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The 3D phase diagram of iron pnictides where the critical temperature dependson charge density and microstrain in the active FeAs layers is proposed. Theiron pnictides superconductors are shown to be a practical realization of aheterostructure at the atomic limit made of a superlattice of FeAs layersintercalated by spacer layers. We have focussed our interest on the A 1-xBxFe2As2 (122) families and we show that FeAs layers have a tensile microstraindue to the misfit strain between the active layers and the spacers. We haveidentified the critical range of doping and microstrain where the criticaltemperature gets amplified to its maximum value.

The Microstrain-Doping Phase Diagram of the Iron Pnictides Heterostructures at Atomic Limit