1301.4365 (E. D. L. Rienks et al.)

Electronic structure and quantum criticality in
Ba(Fe$_{1-x-y}$Co$_{x}$Mn$_{y}$)$_{2}$As$_{2}$, an ARPES study    [PDF]

E. D. L. Rienks, T. Wolf, K. Koepernik, I. Avigo, P. Hlawenka, C. Lupulescu, T. Arion, F. Roth, W. Eberhardt, U. Bovensiepen, J. Fink

We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic structure of Ba(Fe1-x-yCoxMny)2As2 for x=0.06 and 0<=y <=0.07. We derive a non-rigid-band like change of the electronic structure as a function of Mn substitution and an effective doping close to one hole per Mn ion. 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.

View original: http://arxiv.org/abs/1301.4365