Electron and hole doping effects in Sr2FeMoO6 double perovskites

Abstract Electron and hole doping effects in the ferromagnetic and structural properties of the double perovskite Sr 2 FeMoO 6 are studied along the series Sr 2− x La x FeMoO 6 (0⩽ x ⩽1) and Sr 2− x FeMoO 6 (0⩽ x ⩽0.4) from neutron powder diffraction and magnetization data. Sr-deficient samples (hole doped) show moderate changes in the structure and both T c and M s rapidly decrease with x . On the contrary, a change from tetragonal to monoclinic symmetry and a non monotonic behaviour in T c is found in the La-substituted series (electron doped).