Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.91: Poster
Wednesday, March 29, 2006, 14:30–18:30, P1
Structural properties of Ru-codoped La1−xSr1+xMnO4 — •O. Schumann1, D. Senff1, M. Kriener1, I. Klassen1, N. Hollmann1, T. Lorenz1, A. Revcolevschi2, G. Andre3, F. Bouree3 und M. Braden1 — 1II. Physikalisches Institut, Universität zu Köln — 2LPCES, Universite Paris Sud XI — 3Laboratoire Léon Brillouin
We present x-ray and neutron scattering studies on ruthenium co-doped La1−xSr1+xMnO4. This co-doping leads to a suppression of charge, orbital and magnetic order.
La0.5Sr1.5MnO4 is the 2D-analogon of the half-doped 3D-perovskite manganites (Mn3+:Mn4+=1:1). While showing similar charge, orbital and spin order, a CMR effect is only observed in a very high field. As the CMR-effect in the 3D-manganites is due to a competition between antiferromagnetic (insulating) and ferromagnetic (metallic) interactions, this high field indicates a rather stable AF-order in the layered compound. To weaken this order we prepared several single crystals of Ru-codoped La0.5Sr1.5MnO4, with Ru concentrations ranging from 2% up to 30%. Neutron diffraction, magnetization measurements and resistivity measurements shows, that Ruthenium doping rapidly suppress the charge and orbital order. Furthermore we find a ferromagnetic ground-state and an increased magnetoresistivity.