Multiband model for penetration depth in MgB2

TL;DR

This paper uses first principles calculations to analyze the temperature dependence and anisotropy of the magnetic field penetration depth in MgB2, emphasizing the importance of impurity scattering and the two-band model for accurate description.

Contribution

It provides a theoretical study combining electronic structure calculations with the two-band model to explain experimental penetration depth data in MgB2.

Findings

Two-band model fits experimental data well

Impurity scattering is crucial for accurate modeling

Temperature dependence and anisotropy are explained theoretically

Abstract

The results of first principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the magnetic field penetration depth. The effects of impurity scattering are essential for a proper description of the experimental results. We compare our results with experimental data and we argue that the two-band model describes the data rather well.