Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.11: Poster
Wednesday, April 3, 2019, 15:00–18:30, Poster D
Phonon anomalies in FeS — •Leander Peis1,2, Andreas Baum1,2, Ana Milosavljević3, Nenad Lazarević3, Miloš M. Radonjić3, Božidar Nikolić4, Merlin Mitscheck1,2, Zahra Inanloo Maranloo1, Maja Šćepanović3, Mirjana Grujić-Brojčin3, Nenad Stojilović3,5, Matthias Opel1, Aifeng Wang6, Cedomir Petrovic6, Zoran V. Popović3,7, and Rudi Hackl1 — 1Walther-Meissner-Institut, 85748 Garching, Germany — 2Fakultät für Physik, Technische Universität München, 85748 Garching, Germany — 3Institute of Physics Belgrade, 11080 Belgrade, Serbia — 4Faculty of Physics, University of Belgrade, Belgrade, Serbia — 5Department of Physics and Astronomy, University of Wisconsin Oshkosh, Oshkosh, WI 54901, USA — 6Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA — 7Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
Tetragonal FeS is studied using Raman spectroscopy. We identify the A1g and B1g phonon modes, a second order scattering process, and contributions from potentially defect-induced scattering. The temperature dependence between 300 and 20 K of all observed phonon energies is governed by the lattice contraction. The increase in energy of all modes below 20 K may indicate short range magnetic order. Lattice-dynamical simulations and a symmetry analysis for potential overtones are in good agreement with the experiments. The two-phonon excitation observed in a gap between the optical branches presumably becomes observable due to significant electron-phonon interaction.