Multiband and impurity effects in infrared and optical spectra of MgB2

TL;DR

This paper reviews optical and infrared measurements on MgB2, analyzing multiband and multigap effects through experimental data and ab initio calculations, focusing on plasma frequency, electron-phonon interactions, impurities, and superconducting gaps.

Contribution

It provides a comprehensive analysis of MgB2's optical properties considering multiband and multigap effects, integrating experimental results with theoretical calculations.

Findings

Identification of plasma frequency and electron-phonon interaction signatures.

Effects of C and Al substitution on optical spectra.

Far-infrared signatures of superconducting gaps.

Abstract

A short review of the optical and far-infrared measurements on MgB$_{2}$ is given. Multiband and multigap effects are analyzed by comparing optical properties with other experiments and {\em ab initio} calculations. The covered topics are: the plasma frequency, electron-phonon interaction, impurity scattering, the effects of C and Al substitution, interband transitions and the far-infrared signatures of the superconducting gaps.