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We present the results of experimental study of electrical properties of textured La0.7Ca0.3MnO3 manganite films, grown onto MgO substrate by laser deposition technique, under influence of high power microwave radiation and strong pulsed DC electric field of nanoseconds duration. Microwave response data of pure polycrystalline La0.7Ca0.3MnO3 films grown onto ZrO / MgO substrate is also presented for comparison. Decrease of electrical resistance of the LCMO / MgO film was observed in the DC electric field at temperatures ranging from 300 down to 78 K. Nonbolometric character of the resistance increase of the textured LCMO / MgO film could be explained by carrier tunnelling through the intergrain boundaries in the strong electric field. Temperature dependence of the resistance change of the LCMO / MgO film in the microwave electric field qualitatively followed the dependence of the electrical resistance derivative with respect to temperature, however the characteristic anomaly related to the PM–FM transition in the material in this case was shifted slightly to the lower temperature region. Time dependences of microwave response of the textured LCMO / MgO film have shown fast rise of the electrical resistance change when the microwave pulse was applied, and relativelly slow relaxation after the end of the pulse, what is related with heat transfer processes from the manganite film to the substrate.

Investigation of polycrystalline LCMO films by strong microwave and DC electric fields