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Superconductors close to quantum phase transitions often exhibit asimultaneous increase of electronic correlations and superconducting transitiontemperatures. Typical examples are given by the recently discovered iron-basedsuperconductors. We investigated the band-specific quasiparticle masses ofAFe2As2 single crystals with A = K, Rb, and Cs and determined their pressuredependence. The evolution of electronic correlations could be tracked as afunction of volume and hole doping. The results indicate that with increasingalkali-metal ion radius a quantum critical point is approached. The criticalfluctuations responsible for the enhancement of the quasiparticle masses appearto suppress the superconductivity.

Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity