Abstract
La0.7Sr0.3MnO3 (LSMO) and La0.7Ba0.3MnO3 (LBMO) Polycrystalline manganite nanoparticles were prepared by combustion method using glycine fuel. The ignition process was done at 360 °C and 330 °C for LSMO and LBMO, respectively. Both of the samples have rhombohedral structure using XRD analysis. The reduction is observed in electrical resistivity when external magnetic field is applied during the decrease in temperature from 300 to 89 °K, which is due to the tunneling between particles. The magnetoresistance (MR) of samples was measured in this range of temperature in both the presence and absence of a magnetic field of about 10 kG. The colossal role of a kind of extrinsic MR which is 19% and 22% for LSMO and LBMO, respectively, has been investigated in this research. The metal–insulator transition temperature of 200 °K is recorded for LBMO.
Highlights
A wide range of researches have been conducted on manganese oxide compounds with perovskite structure called manganite with chemical formula of REMnO3 (RE: trivalent rare-earth ion like La, Pr, Sm & Nd)
This structure is an antiferromagnetic insulator [1] and what makes it considerable is the mixed valence manganites with general structure of RE1−xAExMnO3 (AE: divalent alkaline-earth ion like Sr, Ca, Ba, etc.) which is practical in many different fields of industrial technology [2]
The REMnO3 has an orthorhombic distortion and after substitution into specific ratio (RE1−xAExMnO3), the distortion transforms to the rhombohedral one which is better than the orthorhombic in structural, electrical and magnetic properties [2, 3]
Summary
A wide range of researches have been conducted on manganese oxide compounds with perovskite structure called manganite with chemical formula of REMnO3 (RE: trivalent rare-earth ion like La, Pr, Sm & Nd). The REMnO3 has an orthorhombic distortion and after substitution into specific ratio (RE1−xAExMnO3), the distortion transforms to the rhombohedral one which is better than the orthorhombic in structural, electrical and magnetic properties [2, 3] These materials show many phenomenon, such as colossal magnetoresistance CMR [2] and magneto caloric effect MCE [4], which recently is massively attractive in technical field and have potential applications in solid oxide fuel cells [5], magnetic sensors [6], spintronic [6], biomedical field [3] and magnetic refrigeration technology [4].
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