Workshop "NMR, µSR, Mössbauer spectroscopies in the study of Fe-based and other unconventional high-Tc superconductors"
Momentum, orbital, and doping dependent scattering rates in NaFe1-xCoxAs and BaFe(As1-xPx)2 investigated by ARPES
Jörg Fink, IFW Dresden, Germany
There is a general scenario in which the mechanism of unconventional superconductivity is described by a coupling of the charge carriers to quantum critical antiferromagnetic fluctuations. In this contribution we present a first attempt to measure the concentration dependent scattering rates of the charge carriers due to a coupling to spin reversing inter-band transitions between hole and electron pockets in ferropnictides. We analyse the energy and momentum dependent life-time of the quasi-particles using angle-dependent photoemission spectroscopy (ARPES). In this way information on a possible enhancement of the scattering rates at a quantum critical point can be obtained. Furthermore the scattering rates are studied at various high-symmetry points in the Brillouin zone thus providing information on cold and hot spots at the Fermi surface.