Ove Jepsen

TL;DR: In this article, the frequency-dependent $U$U$ was calculated for some of the materials and compared with the constrained local density approximation (LDA) method in a number of cases.

TL;DR: A very simple method is presented for calculating the appropriate combination of hopping matrix elements needed in the impurity Anderson model for a substitutional impurity and it is shown that to a good approximation it is sufficient to know the potential of the impurities atom and the local density of states of the unperturbed host.

TL;DR: In this paper, the band disparity of the electronic structure is taken into account, not only in the superconducting state, but also in normal transport in MgB2.

TL;DR: In this paper, a theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions, and the gap functions in different bands in Mg-B2 are obtained from an extended Eliashberg formalism, using the results of band structure calculations.

TL;DR: In this paper, the Eliashberg equations were solved for both an isotropic one-band model and a twoband model with different superconducting gaps on the π-band and σ-band Fermi surfaces.