Dielectric barrier formation and tunneling magnetoresistance effect in strontium iron molybdate
authors Dem'yanov, SE; Kalanda, NA; Kovalev, LV; Avdeev, MV; Zheludkevich, ML; Garamus, VM; Willumeit, R
nationality International
abstract A comparative X-ray diffraction study of the initial single-phase metal-oxide compound-strontium iron molybdate Sr2FeMoO6 - delta (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.
issn 1063-7850
year published 2013
volume 39
issue 6
beginning page 552
ending page 555
digital object identifier (doi) 10.1134/S1063785013060199
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000322387400016
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