Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides
Fink, J. · Charnukha, A. · Rienks, E. D. L. · Liu, Z. H. · Thirupathaiah, S. · Avigo, I. · Roth, F. · Jeevan, H. S. · Gegenwart, P. · Roslova, M. · Morozov, I. · Wurmehl, S. · Bovensiepen, U. · Borisenko, S. · Vojta, M. · Buechner, B.
Original · EN
Angle-resolved photoemission spectroscopy (ARPES) is used to study the band dispersion and the quasiparticle scattering rates in two ferropnictides systems. Our ARPES results show linear-in-energy dependent scattering rates which are constant in a wide range of control parameter and which depend on the orbital character of the bands. We demonstrate that the linear energy dependence gives rise to weakly dispersing band with a strong mass enhancement when the band maximum crosses the chemical potential. In the superconducting phase the related small effective Fermi energy favors a Bardeen-Cooper-Schrieffer (BCS)Bardeen1957-Bose-Einstein (BE)Bose1924 crossover state.
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