Abstract.
We study the influence of electron doping in Ba1 + x Sr1-3x La2x FeMoO6 (\(x\le 0.3\)) double perovskites, where the designed combination for the cationic site minimizes the influence of steric effects. We find an increase of the Curie temperature (T C ), which supports the claim of the important role played by the band filling in the value of T C . Other effects like changes in the bare electronic bandwidth (determined by structural parameters) and Fe/Mo antisite defects seem to play a less relevant role in the increase of T C in this series. Changes in structural parameters, magnetization and magnetotransport properties as a function of Ba/La doping are correlated with an increase of the density of states at the Fermi level and a moderate rise of antisites.
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Received: 2nd April 2004, Published online: 18 June 2004
PACS:
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) - 75.30.Cr Saturation moments and magnetic susceptibilities - 72.25.Mk Spin transport through interfaces - 61.12.Ld Neutron diffraction - 75.70.Pa Giant magnetoresistance - 75.50.Gg Ferrimagnetics
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Serrate, D., De Teresa, J.M., Blasco, J. et al. Increase of Curie temperature in fixed ionic radius Ba\(_\mathsf{1 + x}\)Sr \(_\mathsf{1-3x}\)La\(_\mathsf{2x}\)FeMoO\(_\mathsf{6}\) double perovskites. Eur. Phys. J. B 39, 35–40 (2004). https://doi.org/10.1140/epjb/e2004-00167-0
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DOI: https://doi.org/10.1140/epjb/e2004-00167-0