Regensburg 2010 – wissenschaftliches Programm
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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.