Magnetoresistance temperature dependence of LSMO and LBMO perovskite manganites
الموضوعات : Journal of Theoretical and Applied Physics
Z. Jafari Razi
1
(Department of Physics, Science and Research Branch, Islamic Azad University)
S. A. Sebt
2
(Department of Physics, Science and Research Branch, Islamic Azad University)
A. Khajehnezhad
3
(Department of Physics, Science and Research Branch, Islamic Azad University)
الکلمات المفتاحية: Manganites, Magnetoresistance, Low temperature, Combustion method,
ملخص المقالة :
AbstractLa0.7Sr0.3MnO3 (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.
