Abstract
Double perovskite compounds (Sr 2− x Eu x )FeMoO 6 (0≤ x≤0.3) were prepared by solid-state reaction at high temperature. Crystal structure, magnetic and transport properties of the compounds were investigated. The crystal structure of the compounds changes from an I4/ m lattice to an Fm3¯ m lattice around x=0.1. The unit-cell volume decreases with the doping level in both the I4/ m lattice and the Fm3¯ m lattice. The resistivity of the compounds shows a metal–semiconductor transition, and the transition temperature T M–S increases with the doping level. However, Curie temperature ( T C) of the compounds exhibits a weak dependence on the doping level. The saturation magnetization ( M S) at 100 K varies almost linearly with the anti-site defect concentration and agrees well with the simple FIM model. In contrast to the Ce-, Pr-, Nd- and Sm-doped Sr 2FeMoO 6, the difference of M S of (Sr 2− x Eu x )FeMoO 6 between 5 and 100 K indicates that the moment of Eu 3+ is antiparellel to that of Fe 3+ at low temperature.
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