Electronic structure and quantum criticality in Ba(Fe1-x-y CoxMny)2As2, an ARPES study

We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic structure of for and . From ARPES we derive that the substitution of Fe by Mn does not lead to hole doping, indicating a localization of the induced holes. An evaluation of the measured spectral function does not indicate a diverging effective mass or scattering rate near optimal doping. Thus, the present ARPES results indicate a continuous evolution of the quasiparticle interaction and therefore question previous quantum critical scenarios.