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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.148: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

XPS and Mössbauer studies of grain boundary effects in highly ordered Sr2FeMoO6 — •M. Raekers1, C. Taubitz2, K. Kuepper2, H. Hesse1, I. Balasz3, I. G. Deac3, S. Constantinescu4, M. Valeanu4, E. Burzo3, and M. Neumann11Universität Osnabrück, Fachbereich Physik, Barbarastr. 7, D-49069 Osnabrück, Germany — 2Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Rossendorf, 01314 Dresden, Germany — 3Faculty of Physics, Babes-Bolyai University, 3400, Cluj-Napoca, Romania — 4National Institute of Materials Physics, P.O. Box MG-07, Bucharest, Romania

Sr2FeMoO6 is magneto resistance (MR) compound which has attracted much attention in the last years. Our work group has already studied this compound intensely[1,2]. Here we present the oxidation states of Fe and Mo and the presence of grain boundaries in the magneto resistance (MR) compound Sr2FeMoO6 by means of x-ray photoelectron spectroscopy (XPS) and Mössbauer spectroscopy. 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 crystal. The influence of the grain boundaries will be discussed.

[1] J. Phys.: Condens. Matter 17 (27): 4309-4317 (2005)

[2] phys. stat. sol. (a), 201, No. 15, 3252-3256 (2004)

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