Recent reports on quantum oscillations in ${\mathrm{MgB}}_2$ provide valuable information on three important aspects of this material: (i) electronic structure near the Fermi level, (ii) disparity of the electron-phonon interaction between the two systems of bands, and (iii) renormalization of spin susceptibility. However, extraction of most of this information requires highly accurate band-structure calculations of the relevant quantities. In this paper we provide such calculations and use them to analyze the experimental data.

• Received 15 January 2002

DOI:https://doi.org/10.1103/PhysRevB.65.180510