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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.25: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Investiagtion of AFe₂As₂ – compounds by means of x-ray spectroscopy — •Anna Buling¹, Ernst Kurmaev², J. A. McLeod³, Alexander Moewes³, and Manfred Neumann¹ — ¹Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany — ²Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg, Russia — ³Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2

The discovery of superconductivity in FeAs – compounds gives rise to a high advance in the research of high – temperature superconductors. Shortly after finding supercondutivity in the rare – earth compounds (REOFeAs, RE=rare-earth) further compounds with Fe₂As₂ layers were discribed.
Different compounds of the new superconductor family AFe₂As₂ (A= Ba, Ca) were investigated by means of x-ray spectroscopy. On the basis of XPS Fe 2p core level spectra of doped and undoped compounds we discuss the Fe 3d electrons to be not strongly but weakly or at most moderatly correlated. The valence band spectra show that the Fermi level is dominated by the Fe 3d states. The influence of doping of the host material with different metals is determined and offers new results in the superconducting behavior of these compounds.