2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162036We study the effect of magnetic Mn ions on the two-band superconductor MgB_2, and compute both the total and spin resolved scanning tunneling spectrum in the vicinity of the magnetic impurity. We show that when the internal structure of the Mn ion's d-shell is taken into account, multiple Shiba states appear in the spectrum. The presence of these multiplets could alter significantly the overall interpretation of local tunneling spectra for a wide range of superconducting hosts and magnetic impurities.11 pages, 9 figures in eps format. accepted for publication in Phys. Rev. BSuperconductivitytext