Nonlinear phenomena in point-contact electric conductivity of organic conductor [(C_2H_5)_4N]_(0.5)[Ni(dmit)_2]

摘要

The organic conductor [(C_2H_5)_4N]_(0.5)[Ni(dmit)_2] has been synthesized and second derivatives of current-voltage characteristics have been measured for Cu-[(C_2H_5)_4N]_(0.5)[Ni(dmit)_2] heterocontacts. The nonlinearities of those characteristics (the point-contact spectra) revealed at energies exceeding 32 meV (the boundary energy of electron-phonon interaction in copper) are related to charge carriers interaction with vibrational modes of the organic molecule. The mean and root-mean-square vibration frequency as well as the electron-phonon interaction constant have been calculated.