Physics – Condensed Matter – Materials Science
Scientific paper
2003-04-28
Physics
Condensed Matter
Materials Science
Revtex, 4 Journal pages, 2 figures, 1 table
Scientific paper
10.1103/PhysRevB.68.012412
By means of high resolution neutron powder diffraction at low temperature we have characterized the structural details of $\rm La_{x}Sr_{2-x}FeMoO_6$ ($0\leq {\rm x}\leq 0.5$) and $\rm Ca_{x}Sr_{2-x}FeMoO_6$ ($0\leq {\rm x}\leq 0.6$) series of compounds. This study reveals a similar variation of the mean bond-angle \FeOMo in both series. In contrast, the mean bond-distance \FeMoO\ increases with La but not with Ca substitution. Both series also present a different evolution of the Curie temperature ($T_C$), which raises in the La series and slightly decreases in the Ca one. We thus conclude that the enhancement of $T_C$ in the La series is due to the electron filling of the conduction band and a concomitant rising of the density of states at the Fermi level.
Fontcuberta Josep
Frontera Carlos
García-Muñoz José Luis
Navarro Jose
Ritter Clemens
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