Signatures of electron-boson coupling in half-metallic ferromagnet Mn${}_5$Ge${}_3$: study of electron self-energy $\Sigma (\omega )$ obtained from infrared spectroscopy

Abstract

We report results of our infrared and optical spectroscopy study of a half-metallic ferromagnet Mn${}_5$Ge${}_3$. This compound is currently being investigated as a potential injector of spin polarized currents into germanium. Infrared measurements have been performed over a broad frequency (50 - 50000 cm${}^{-1}$) and temperature (10 - 300 K) range. From the complex optical conductivity $\sigma (\omega )$ we extract the electron self-energy $\Sigma (\omega )$. The calculation of $\Sigma (\omega )$ is based on novel numerical algorithms for solution of systems of non-linear equations. The obtained self-energy provides a new insight into electron correlations in Mn${}_5$Ge${}_3$. In particular, it reveals that charge carriers may be coupled to bosonic modes, possibly of magnetic origin.

References in corpus (3)

• Half-metallic ferromagnets: From band structure to many-body effects
• Optical determination of the relation between the electron-boson coupling function and the critical temperature in high T${}_c$ cuprates
• Evidence for a pseudogap in underdoped $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ and $YB{a}_{2}C{u}_3{O}_{6.50}$ from in-plane optical conductivity measurements

Cited by in corpus (2)

• Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
• Momentum Dependence of the Single-Particle Self-Energy and Fluctuation Spectrum of Slightly Underdoped Bi_2 Sr_2 CaCu_2 O_{8+δ} from High Resolution Laser ARPES