Materials Science Forum, Vol.373-3, 609-612, 2001
Charge ordering and insulator-metal transition of epitaxial Pr1-xCaxMnO3
The temperature dependence of resistivity and magnetization for Pr0.65Ca0.35MnO3 thin films prepared by a pulsed-laser deposition was measured in a temperature range of 4.2 - 300 K. A formation of metallic phase is suggested by the analysis of the temperature dependence of resistivity at low temperatures at zero-magnetic field. It is shown that the appearance of the charge-ordered state at 205 K can be controlled by the lattice strains accumulated during the film growth. The charge-ordering energy gap was estimated to be 77.5 meV from the experimental data. Experimental results are interpreted on the basis of the phase-separation model.
Keywords:Pr1-xCaxMnO3;pulsed-laser deposition;thin film;resistivity;magnetization;charge ordering;phase separation