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The effect of electron doping on the magnetic properties of theBrownmillerite-type bilayered compounds has been investigated by neutron powderdiffraction in La substituted Ca2.5-xLaxSr0.5GaMn2O8 compounds (x = 0.05 and0.1), in comparison with the undoped compound (x = 0). In all compounds, along-range three dimensional collinear antiferromagnetic (AFM) structure isfound below the N\'eel temperature TN of respective compound, whereas, wellabove TN, three dimensional short-range magnetic ordering is observed. In theintermediate temperature range just above TN, a strong effect of electrondoping (La substitution) on the magnetic correlations has been observed. Here,a short-range AFM correlation with possible dimensionality of three has beenfound for substituted compounds (x = 0.05 and 0.1) as compared to the reportedtwo dimensional long-range AFM ordering in the parent compound. With increasingthe electron doping, a decrease in TN is also observed. The short-rangemagnetic correlations set in over a large temperature range above TN. Amagnetic phase diagram in the x-T plane is proposed from these results.

journal of physics. condensed matter

Effect of electron doping on the magnetic correlations in the bilayered  brownmillerite compound Ca_{2.5-x}La_{x}Sr_{0.5}GaMn_{2}O_{8}: a neutron  diffraction study