Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Focused Session: Magnetism & Superconductivity in Fe-based Pnictides and Chalcogenides (jointly with MA)
TT 54.3: Topical Talk
Donnerstag, 14. März 2013, 10:30–11:00, H20
A Light Scattering Study of the Evolution of Pairing in Fe-based Superconductors — •Rudi Hackl1, Florian Kretzschmar1, Bernhard Muschler1, Thomas Böhm1, Hai-Hu Wen2, Vladimir Tsurkan3,4, Joachim Deisenhofer3, and Alois Loidl3 — 1Walther-Meissner-Institut, DE-85748 Garching — 2Nanjing University, Nanjing 210093, China — 3University of Augsburg, DE-86159 Augsburg — 4Academy of Sciences of Moldova, MD-2028 Chisinau
The iron-based superconductors are a laboratory for exploring the relevance of electron-electron interactions beyond electron-phonon coupling, being at work in conventional superconductors, since the Fermi surfaces can be varied systematically by atomic substitution. This enables one to systematically study magnetism and superconductivity as a function of the Fermi surface topology. Inelastic light scattering affords a window into the electronic properties of the ordered states. In particular, the evolution of the superconducting pairing upon doping can be probed since light scattering allows access to the anisotropy of the energy gap and, in some cases, of the pairing potential. Ba1−xKxFe2As2 is one of those cases since the competition between s- and d-wave pairing leads to the appearance of exciton-like modes below the gap edges of the various bands. Along with the results from other materials having different Fermi surface cross-sections the data in Ba1−xKxFe2As2 support the spin fluctuation scenario driven by interband coupling. The experiments show that there exist alternative routes for the analysis of the pairing interaction in superconductors with unconventional coupling and anisotropic gaps.