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We present a systematic photoemission study of the newly discovered high Tcsuperconductor class (Sr/Ba)1-xKxFe2As2. By utilizing a unique photon energyrange and scattering geometry we resolve the details of the single particledynamics of interacting electrons on the central Fermi surfaces of this serieswhich shows overall strong coupling behavior (2D/kBTc = 6). Quasiparticledispersion kinks are observed in a binding energy range of 15 to 50 meV whichmatches the magnetic excitation energy scales (parameterized by J1,J2). Thesize of the Cooper pair wavefunction is found to be less than 20A indicating ashort in-plane scale uncharacteristic of a BCS-phonon scenario but suggestiveof a phase factor in the global order parameter. The kink likely reflectscontributions from the strongly frustrated fluctuating spin excitations and thesoft phonons around 20-40 meV. Our results provide important clue to the natureof the pairing potential realized in these superconductors.

Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor