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TT: Fachverband Tiefe Temperaturen
TT 17: SC: Fe-based Superconductors - 1111
TT 17.4: Talk
Monday, March 14, 2011, 19:00–19:15, HSZ 301
(contribution withdrawn) Inelastic neutron scattering on iron arsenide high Tc superconductor CaFe1−xCoxAsF — •Stephen Price1, Yixi Su2, Yinguo Xiao1, Shibabrata Nandi1, Ranjan Mittal3, and Thomas Brueckel1,2 — 1Institute of Solid State Research Forschungszentrum Jülich , Jülich, Germany — 2Jülich Centre for Neutron Science IFF Forschungszentrum Jülich , Jülich, Germany — 3Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Recent discoveries of iron pnictide superconductors such as LaFeAsO1−xFx and Ba1−xKxFe2As2 have generated a huge amount of interest in the studies of high-Tc superconductivity. In a way very similar to cuprates, superconductivity in iron pnictides is in the proximity to magnetism. Prominent features in the spin excitation spectra such as the *spin gap* and *spin resonance* are characteristic to this class of high-Tc superconductors and therefore are believed to be intimately connected to superconductivity. Here we present our recent results on studies of the magnetic excitation spectrum of Co doped CaFe1−xCoxAsF, a member of the 1111-family of pnictide high-Tc superconductors, obtained via time of flight neutron spectroscopy on powder samples. We successfully detected the resonance mode of the short range two dimensional spin dynamics in superconducting CaFe0.88Co0.12AsF and therefore can report the first direct observation of this characteristic feature for a member of oxygen-free 1111 pnictide superconductors.