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Electrical characteristics $(I(eV), dV/dI(eV), d^{2}V/dI^{2}(eV))$ arestudied comprehensively for pressed submicron point contacts between freshfractures of LaSrCuO ceramic pellets and a normal metal (Cu). Point contacts(PC) with the direct-type conductivity are investigated, which arecharacterized by a considerable excess current due to Andreev reflection ofquasiparticles at an NS boundary of high transparency. Basic requirements forpoint contacts suitable for PC measurements are formulated. The models ofinvestigated point contacts permitting the interpretation of the observedcharacteristics are considered. The results of measurement of the energy gapreveal that LaSrCuO is a superconductor with a strong coupling since themaximum value of the ratio $2\Delta/kT\simeq 11$. It is found thatsuperconducting properties may vary appreciably over distances of several tensof angstroms, resulting in some cases in the simultaneous emergence of two gapscorresponding to two critical temperatures. The $dV/dI(eV)$ and$d^{2}V/dI^{2}(eV)$ curves display some high-intensity singularities whoseposition on the eV-axis is practically independent of temperature andcorrelates with the phonon spectrum obtained in neutron scattering experiments.This points to a strong electron-phonon interaction in LaSrCuO.

Investigation of energy gap and observation of electron-phonon  interaction in high-temperature superconductor $La_{1.8}Sr_{0.2}CuO_{4}$ -  normal metal point contacts