Weakly-transmitting junctions usable for tunneling spectroscopy experiments were fabricated from polycrystalline samples of magnesium diboride with a niobium counter-electrode. A strong nonlinear conductance-versus-voltage behavior for voltages above the values corresponding to the energy gaps of the electrodes was interpreted as a fingerprint of the electron-phonon interaction in superconducting MgB₂. A partial Eliashberg spectral function α²(ω)F(ω) was extracted from the data by the numeric inversion of the standard strong-coupling Eliashberg equations. In a full agreement with recent theoretical simulations for magnesium diboride [O. V. Dolgov et al., PRB 68, 132503 (2003)], we have observed a dominant contribution from the π-band of this two-band superconductor.

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