Enhanced low-field-magnetoresistance and electro-magnetic behavior of La0.7Sr0.3MnO3/BaTiO3 composites

We report the structural, magentoresistance and electro-magnetic properties of ferromagnet–ferroelectric–type (1−x)La0.7Sr0.3MnO3/xBaTiO3 (with x=0.0%, 3.0%, 6.0%, 12%, 15.0% and 18.0%, in wt%) composites fabricated through a solid-state reaction method combined with a high energy milling method. Th...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2012-09, Vol.407 (18), p.3774-3780
Main Authors: Phong, P.T., Manh, D.H., Dang, N.V., Hong, L.V., Lee, I.J.
Format: Article
Language:English
Subjects:
Barium titanates
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electrical resistivity
Electrical transport
Exact sciences and technology
Grain boundaries
Grain boundary
Low field magnetoresistance
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetoresistance
Magnetoresistivity
Magnetotransport phenomena, materials for magnetotransport
Manganites
Manganites composites
Physics
Transition temperature
Tunneling
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Summary:We report the structural, magentoresistance and electro-magnetic properties of ferromagnet–ferroelectric–type (1−x)La0.7Sr0.3MnO3/xBaTiO3 (with x=0.0%, 3.0%, 6.0%, 12%, 15.0% and 18.0%, in wt%) composites fabricated through a solid-state reaction method combined with a high energy milling method. The insulator–metal transition temperature shifts to a lower temperature and resistivity increases while the feromagnetic–paramagnetic transition temperature remains almost unchanged with the increase of BaTiO3 content. Magnetoresistance of the composites at an applied magnetic field H=3kOe is enhanced in the wide temperature ranges with the introduction of BaTiO3, which could be explained by the enhanced spin polarized tunneling effect induced by the introduction of BaTiO3. The low-field magnetoresistance of the composite is analyzed in the light of a phenomenological model based on the spin polarized tunneling at the grain boundaries. Furthermore, the temperature dependence of resistivity for this series has been best-fitted by using the adiabatic small polaron and variable range hopping models. These models may be used to explain effect of BTO on the electronic transport properties on high temperature paramagnetic insulating region.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2012.05.060