Electrophysical Properties of Sr2FeMoO6–δ Ceramics with Dielectric Shells

Absence of Weak Localization Effects in Strontium Ferromolybdate

“…The resistivity-versus-temperature plots of SFMO ceramics in a magnetic field [36] are very similar to those of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3 thin films [25,27]. A resistivity minimum also appears in polycrystalline SFMO ceramics at low temperatures [36], which was explained by weak localization [59]. In this case, a quantum correction term (AWT p/2 ) [25,59] was added to the residual resistivity (σ0), and an electron interaction term (ApT n ) was added to the resistivity.…”

“…Weak localization effects were taken into account in order to explain the presence of minima in the ρ-T curves of perovskite oxides exhibiting metallic conductivity [25,27,33,58,59]. It has been suggested [29,30] that the resistivity minimum and, consequently, the resistivity upturn at lower temperatures arise from the competition of two contributions-one usual increase combined with a decrease with the increase in the temperature of the other.…”

“…A resistivity minimum also appears in polycrystalline SFMO ceramics at low temperatures [36], which was explained by weak localization [59]. In this case, a quantum correction term (A W T p/2 ) [25,59] was added to the residual resistivity (σ 0 ), and an electron interaction term (A p T n ) was added to the resistivity. A similar approach was applied to perovskite ceramics (LaNi x Co 1-x O 3 and Na x Ta y W 1-y O 3 [60], La 0.5 Pb 0.5 MnO 3 and La 0.5 Pb 0.5 MnO 3 ceramics containing 10 at.% Ag in a dispersed form [23]).…”