The controlled charge ordering and evidence of the metallic state in Pr0.65Ca0.35MnO3 films

The resistivity of Pr0.65Ca0.35MnO3 films prepared by pulsed laser depositi on has been measured in the temperature range 4.2-300 K. The formation of m etallic phase is suggested by the analysis of the temperature dependence of resistivity at low temperatures under zero-magnetic field. It is shown tha t 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. Experi mental results are interpreted on the basis of the phase-separation model.