Browsing by Author "Baum, Andreas"

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    Phonon anomalies in FeS
    Baum, Andreas; Milosavljević, Ana; Lazarević, Nenad; Radonjić, Miloš; Nikolić, Božidar; Mitschek, Merlin; Maranloo, Z. Inanloo; Šćepanović, Maja; Grujić-Brojčin, Mirjana; Stojilović, Nenad; Opel, Matthias; Wang, Aifeng; Petrović, Čedomir; Popović, Zoran; Hackl, Rudi U.
    We present results from light scattering experiments on tetragonal FeS with the focus placed on lattice dynamics. We identify the Raman active A1g and B1g phonon modes, a second order scattering process involving two acoustic phonons, 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. Below 20 K the phonon energies increase by 0.5-1 cm-1, thus indicating putative short range magnetic order. Along with the experiments we performed lattice-dynamical simulations and a symmetry analysis for the phonons and potential overtones and find good agreement with the experiments. In particular, we argue that the two-phonon excitation observed in a gap between the optical branches becomes observable due to significant electron-phonon interaction.