Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Magnetic Half-metals and Oxides I
MA 44.6: Vortrag
Mittwoch, 16. März 2011, 18:15–18:30, HSZ 401
XMCD study of Ir based double perovskite La2−xSrxCoIrO6 — •Anastasiya Kolchyns’ka1, Philipp Komissinskiy1, Daria Mikhailova1,2, Naren Narayanan1,2, Helmut Ehrenberg2, Fabrice Wilhelm3, and Lambert Alff1 — 1Institute of Materials Science, Technische Universität Darmstadt, Germany — 2Institute of Complex Materials, IFW Dresden, Germany — 3ESRF, ID-12, Grenoble, France
Double perovskites La2−xSrxCoIrO6 with 0≤ x≤2 were studied by X-ray Magnetic Circular Dichroism (XMCD). Neutron scattering has revealed a canted antiferromagnetic order of the Co ions [1]. Only by XMCD the magnetic moments within the Ir sublattice could be determined: For x=0 we observe a magnetization on the Ir site of about 0.2 µB which is coupled antiferromagnetically to the residual Co magnetization. This indicates a kinetically driven induced magnetism at the Ir site similar as in compounds such as Sr2CrOsO6 [2]. With increasing Sr content x, the induced magnetic moment decreases and finally vanishes for x=2.
N. Narayanan et al., Phys. Rev. B 82, 024403 (2010).
[2] Y. Krockenberger et al., Phys. Rev. B 75, 020404(R) (2007).