Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 53: Superconductivity: Fe-based Superconductors - 122
TT 53.2: Vortrag
Mittwoch, 2. April 2014, 09:45–10:00, HSZ 201
Single 20-meV boson mode in KFe2As2 as seen by point-contact spectroscopy — Y. Naidyuk1, O.E. Kvitnitskaya1, N.V. Gamayunova1, L. Boeri2, S. Aswartham3, G. Fuchs3, S. Wurmehl3, •D.V. Efremov3, and S.-L. Drechsler3 — 1B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 61103, Kharkiv, Ukraine — 2Technische Universität Graz, 5150 Institut für Theoretische Physik-Computational Physics, 8010 Graz, Austria — 3Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V.,P.O. Box 270116, D-01171 Dresden, Germany
We investigate the electron-boson interaction in KFe2As2 by point-contact spectroscopy. The point-contact spectrum or the derivative of the differential resistance dR/dV exhibits a pronounced maximum at about 20 meV and surprisingly a featureless behavior at lower and higher energies in our point-contact spectra. We discuss phonon and nonphonon (excitonic) mechanisms for the origin of this peak, which may be important for the understanding of serious puzzles of superconductivity in this type of compounds.