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The method of microcontact spectroscopy in the superconducting state was usedto investigate weak nonlinearities of the current-voltage characteristics ofpoint contacts made of $N{{b}_{3}}Sn$ single crystals. The nature of thespectrum of the electron-phonon interaction was found to vary considerably fromcontact to contact, indicating considerable deviations of the composition ofthe surface of $N{{b}_{3}}Sn$ from stoichiometry. A correlation was establishedbetween the nature of the spectrum and the magnitude of the gap singularitiesof the current-voltage characteristics. In the case of "dirty" high-resistancecontacts with strong gap singularities the microcontact spectra were reasonablyreproducible, which made it possible to relate them sufficiently closely to themicrocontact function of the electron-phonon interaction in the bulk material.It was found that microcontact spectroscopy of this interaction was possible inthe superconducting state not only in dirty $S-c-S$ contacts, but also in dirty$S-c-N$ contacts.

Investigation of the electron-phonon interaction in $N{{b}_{3}}Sn$ with the aid of microcontacts