Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 25: FS: Iron-Based Superconductors
TT 25.5: Topical Talk
Wednesday, March 24, 2010, 16:15–16:45, H20
Lattice dynamics and magnetism in layered iron based superconductors — •Thomas Brückel1,2, Yixi Su2, Yinguo Xiao1, and Ranjan Mittal2 — 1Forschungszentrum Jülich, Institut für Festkörperforschung IFF, 52425 Jülich, Germany — 2Forschungszentrum Jülich, Jülich Centre for Neutron Science JCNS, Outstation at FRM II, 85747 Garching, Germany
The discovery of superconductivity in layered iron based compounds at critical temperatures of up to some 56 K has attracted much attention by the solid state physics community. Scattering methods, in particular neutron scattering and resonant x-ray scattering, prove crucial to access microscopic information about these new classes of compounds. We have employed inelastic neutron scattering to study the phonon density of states as well as full phonon dispersion relations [1]. The proximity to magnetism suggests that magnetic order and spin fluctuations play an important role in these compounds [2]. We will review our experimental findings on ordering phenomena and spin- and lattice excitations and discuss their possible relevance for superconductivity.
[1] R. Mittal et al., Phys. Rev. B 78 (2008), 104514; R. Mittal et al., Phys. Rev. B 78 (2008), 224518 (R); R. Mittal et al., PRL 102 (2009), 217001; R. Mittal et al., Phys. Rev. B 79 (2009), 144516; R. Mittal et al., Phys. Rev. B 79 (2009), 214514
[2] Y. Su et al., Phys. Rev. B 79 (2009), 064504; Y. Xiao et al., Phys. Rev. B79, 060504 (R)