Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: FS: Iron-Based Superconductors
TT 25.8: Vortrag
Mittwoch, 24. März 2010, 17:30–17:45, H20
Doping evolution of the electronic density of states and the gap symmetry in Co-doped 122 iron pnictides — •Frédéric Hardy1, Thomas Wolf1, Peter Schweiss1, Peter Adelmann1, Robert A. Fisher2, Rolf Heid1, Robert Eder1, Hilbert v. Löhneysen1, and Christoph Meingast1 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA
Iron pnictides represent a new class of multiband superconductors which offer new possibilities for studying the interplay between magnetism and superconductivity. In these materials, solid experimental evidence for any particular pairing state remains elusive because several probes point to different conclusions. Some of these apparent contradictions may arise from the influence of the magnetic instability, which is expected to strongly alter the gap topology, from impurity effects, or from experimental difficulties like sample inhomogeneities. Here, we present a critical analysis of our own specific-heat and thermal expansion-data, realized on high-quality flux-grown Co-doped 122 single crystals, for doping levels that cover the entire phase diagram.