Effect of laser energy on the electrical transport properties of La 0.67 Ca 0.33 MnO 3 :Ag 0.2 films by pulsed laser deposition technique

摘要: La0.67Ca0.33MnO3 (LCMO):Ag0.2 films were grown on LaAlO3 (LAO) substrates (100) by pulsed laser deposition (PLD) technique with various incident energies. The surface morphologies and the thicknesses of studied atomic force microscopy (AFM) scanning electron (SEM), respectively. crystal structures analyzed X-ray, diffraction (XRD), temperature dependence resistivity (ρ–T) was standard four-probe method. It can be found that quality, morphology, metal–insulator transition (T p), coefficient resistance (TCR) LCMO:Ag0.2 are changed energy. highest T p 287 K is obtained 300 mJ energy; meanwhile, optimal TCR 13.5% K−1 achieved. results suggest electrical transport properties affected interface-induced compressive stress, oxygen balance, double exchange between Mn3+–O–Mn4+.