%0 journal article %@ 1063-7850 %A Dem'yanov, S.E., Kalanda, N.A., Kovalev, L.V., Avdeev, M.V., Zheludkevich, M.L., Haramus, V.M., Willumeit, R. %D 2013 %J Technical Physics Letters %N 6 %P 552-555 %R doi:10.1134/S1063785013060199 %T Dielectric barrier formation and tunneling magnetoresistance effect in strontium iron molybdate %U https://doi.org/10.1134/S1063785013060199 6 %X A comparative X-ray diffraction study of the initial single-phase metal-oxide compound-strontium iron molybdate Sr2FeMoO6 − δ (SFMO)-and that subjected to additional isothermal annealing shows that this heat treatment leads to the appearance of a SrMoO4 (SMO) phase. Small-angle neutron scattering measurements indicate that the SMO phase forms a dielectric shell surrounding SFMO grains, which has a characteristic thickness of 2–4 nm and extends above 120 nm. The character of the temperature dependence of the electric resistance corresponds to the metal-type conduction in single-phase SFMO and changes to a semiconductor type in the material with SMO dielectric shells, which is evidence of a tunneling mechanism of charge transfer. This conclusion is confirmed by an increase in the absolute value of the negative magnetoresistance of SFMO due to the appearance of a tunneling magnetoresistance component of the same sign.