Boichenko D. Nonequilibrium effects in conduction metal-manganite

The aim is to study the nature of charge dynamics in manganites and the nature of the appearance of hysteresis current-voltage characteristics in metal-manganite. The objects of investigation were polycrystalline samples of lanthanum manganites optimal composition of LCMO, LSMO. The main research method was the method of tunneling spectroscopy, through which were obtained by the experimental results, the main ones are as follows. On the basis of tunnel experiments carried out with the metal-manganite, the possibility of polaron nature of the dynamics of carriers in the metallic phase of manganites. Revealed that the occurrence of hysteresis current-voltage characteristics of tunnel junctions metal - manganite due to the transfer of the energy of hot electrons generated in a tunnel junction, on the activation complex. This leads to displacement of oxygen ions and vacancies as a result, a significant change in electrical resistance of the contact. Experimentally found that this effect has a potential character. With the current-voltage characteristics of tunnel junctions with different initial resistance was found the activation energy of oxygen anions in the lanthanum manganites. Proved that the effects of activation of oxygen anions occur in both the interface and the barrier tunnel junction. This leads to a sharp increase in current, as in both positive and negative branch of the current-voltage characteristics of metal-manganite. These results can be used, for example, in the electronic industry in the creation the new generation of computer memory devices.