Abstract
We report here the low temperature (below transition temperature T P) resistivity behavior of Ce doped La 0.7Ca 0.3MnO 3. Polycrystalline samples of compositions La 0.7Ca 0.3MnO 3 (sample 1), La 0.7Ca 0.25Ce 0.05MnO 3 (sample 2) and La 0.65Ce 0.05Ca 0.3MnO 3 (sample 3) were prepared by solid state route method. From the XRD studies, it is revealed that all the samples exhibit the single phase with orthorhombic structure (Space group Pnma). From the resistivity data, it is found that all the samples show metal to insulator transition and with the Ce doping the transition temperature ( T P) decreases. The resistivity data in the metallic region from 55 K to 190 K show T 2 dependence for all the samples, consistent with the electron–electron scattering. In the temperature range above 190 K, the two-magnon and electron–phonon processes contribute to scattering of carriers. It is also found that the value of resistivity increases with the doping of Ce on Ca site but decreases with the doping of Ce on La site.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call