Conduction mechanisms in partially crystallized (La,Na)MnO3 films

The electric and magnetoresistive properties of partially crystallized (La,Na)MnO3 films near the paramagnet-ferromagnet transition are investigated. The objects of study are films obtained on polychore substrates by magnetotron sputtering and substrate temperatures 300 and 500°C. The temperature behavior of the electric resistance is analyzed to determine the limits of between the experimental data and the existing theoretical models. A generalized picture of the evolution of conduction mechanisms accompanying a change in temperature and regimes of heat treatment of the samples is constructed. It is shown that a correlation exists between the character of the temperature variation of the magnetoresistance and the change in the conduction mechanisms. The characteristic temperatures which describe the boundaries of the regions in which a definite conduction mechanism dominates are established.