Spectroscopy of boson excitations in the nanoscale vicinity of metal-doped manganite interface

The results of tunneling measurements of the spectra of quasiparticle excitations of the Bose type in a nanoscale region at a surface of doped manganite immediately adjacent to a metal-oxide interface are presented. A comparison of the results with the published data for the corresponding bulk samples indicates that the properties of complex oxides of manganese near an interface are not substantially different from those in the bulk of the material. It is found that when a high voltage pulse is applied, the spectra are smoothed out and the intensity of low-frequency excitations grows on account of structural disordering of the sample in the vicinity of the interface