Spin-resolved spectra of Shiba multiplets from Mn impurities in MgB_2

摘要

We 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 thevicinity of the magnetic impurity. We show that when the internal structure ofthe Mn ion's d-shell is taken into account, multiple Shiba states appear in thespectrum. The presence of these multiplets could alter significantly theoverall interpretation of local tunneling spectra for a wide range ofsuperconducting hosts and magnetic impurities.