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By means of high resolution neutron powder diffraction at low temperature wehave characterized the structural details of $\rm La_{x}Sr_{2-x}FeMoO_6$($0\leq {\rm x}\leq 0.5$) and $\rm Ca_{x}Sr_{2-x}FeMoO_6$ ($0\leq {\rm x}\leq0.6$) series of compounds. This study reveals a similar variation of the meanbond-angle \FeOMo in both series. In contrast, the mean bond-distance \FeMoO\increases with La but not with Ca substitution. Both series also present adifferent evolution of the Curie temperature ($T_C$), which raises in the Laseries and slightly decreases in the Ca one. We thus conclude that theenhancement of $T_C$ in the La series is due to the electron filling of theconduction band and a concomitant rising of the density of states at the Fermilevel.Comment: Revtex, 4 Journal pages, 2 figures, 1 tabl

Effect of band filling and structural distortions on the Curie temperature of Fe-Mo double perovskites