Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.31: Poster
Montag, 22. März 2010, 14:00–18:00, Poster A
Electronic dispersion anomalies in Fe-pnictide superconductors — •Andreas Heimes1, Roland Grein1,2, Matthias Eschrig1,2,3, and Gerd Schön1,2 — 1Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany — 2DFG Forschungszentrum Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — 3Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
We investigate anomalies in the electronic band dispersion in Fe-pnictides that result from a coupling of electrons to spin fluctuations. It is known from inelastic neutron scattering experiments that a magnetic resonance feature appears in the dynamical spin susceptibility when entering the superconducting state, both in Fe-pnictides and in cuprates. This raises the question, if similar mechanisms are at work. An important question related to this is to which extend the dispersion of the electronic bands is modified by the interaction between electrons and this resonant spin excitation, similarly as it is the case for cuprate superconductors. We present a theoretical study of this problem.