Samofalova V. Tunneling spectroscopy of elementary excitation in strongly correlated systems (metal oxides)

Object: tunnel charge transport (electron-phonon interaction) in strongly correlated electronic systems. The purpose: the determination of electron-phonon interaction in strongly correlated electronic systems (manganites and cuprates), definition of a role of the interbarrier localized conditions in formation of their physical properties, revealing in these systems of elementary excitations of the orbital-ordered conditions. Methods: a method of tunnel spectroscopy of phonon excitations for samples in a normal condition and also numerical methods of the analysis of electron-phonon interaction functions. Results: It is shown, that the dependence of conductivity from voltage on a barrier is well coordinated with behavior of conductivity (sigma (V) ~ V 4/3), caused by presence of the localized conditions in a barrier. Such coordination is seen more strongly in a case of higher resistance on the sample. Numerical restoration and the analysis of electron-phonon interaction functions on the basis of the approach for normal objects is spent and the constants of electron-phonon interactions for manganites and cuprates are calculated. It is determined, that their sizes are close to sizes of superconducting systems (lyambda ~ 2). For the first time the method of tunnel spectroscopy reveals and confirms existence of orbitons, observed earlier in optical experiments. Field of application: physics of solid state, microelectronics