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Investigation of chemical and grain boundary effects in highly ordered Sr2FeMoO6: XPS and Mössbauer studies

M. RAEKERS1,* , K. KUEPPER1,2, H. HESSE1, I. BALASZ3, I. G. DEAC3, S. CONSTANTINESCU4, E. BURZO3, M. VALEANU4, M. NEUMANN1

Affiliation

  1. Dept. of Physics, University of Osnabrück, D-49069 Osnabrück, Germany
  2. Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Rossendorf, 01314 Dresden, Germany
  3. Faculty of Physics, Babes-Bolyai University, 3400, Cluj-Napoca, Romania
  4. National Institute of Materials Physics, P.O. Box MG-07, Bucharest, Romania

Abstract

We have studied the oxidation states of Fe and Mo and the presence of grain boundaries in the magneto resistive (MR) compounds Sr2FeMoO6 by means of x-ray photoelectron spectroscopy (XPS), Mössbauer spectroscopy and electrical resistivity measurements. XPS of the Mo 3d and Fe 3s core levels is indicating a mixed valence state involving around 30% Fe3+- Mo5+ and 70% Fe2+- Mo6+ states. Mössbauer studies confirm the presence of a valence fluctuation state and an essential amount of grain boundaries in the present Sr2FeMoO6 crystals. Resistivities and magnetoresistance studies evidenced strong grain boundary effects..

Keywords

Sr2FeMoO6, Double perovskite, Magnetoresistance, X-ray photoelectron spectroscopy, Mössbauer spectroscopy, Electrical resistivity.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

M. RAEKERS, K. KUEPPER, H. HESSE, I. BALASZ, I. G. DEAC, S. CONSTANTINESCU, E. BURZO, M. VALEANU, M. NEUMANN, Investigation of chemical and grain boundary effects in highly ordered Sr2FeMoO6: XPS and Mössbauer studies, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 455-460 (2006)