  The method of microcontact spectroscopy is used to study alloys with magnetic
impurities CuMn and CuFe in the range of concentrations 0.01-1 at.%. Minima or
maxima (so-called zero-bias anomalies) were observed in the microcontact
spectra of these alloys at voltages ~ 1 mV. The Lande g-factor for the Mn
impurity in a Cu matrix was determined from the splitting of the minimum of the
zero-bias anomaly in a magnetic field. The quantitative calculations carried
out agree well with theory and permit determining both the important geometric
contact parameter <K> i.e., the averaged geometric form factor, and the
characteristics of the alloy itself, for example, J/E_F, i.e., the ratio of the
magnitude of the exchange interaction energy between an electron and the
magnetic impurity to the Fermi energy, from the microcontact spectra.
