Signatures of electron-boson coupling in half-metallic ferromagnet Mn$_5$Ge$_3$: study of electron self-energy $Σ(ω)$ obtained from infrared spectroscopy

Details Signatures of electron-boson coupling in half-metallic ferromagnet Mn$_5$Ge$_3$: study of electron self-energy $Σ(ω)$ obtained from infrared spectroscopy Signatures of electron-boson coupling in half-metallic ferromagnet Mn$_5$Ge$_3$: study of electron self-energy $Σ(ω)$ obtained from infrared spectroscopy

2009-05-22

arxiv.org/abs/0905.3731v1

Phys. Rev. B 80, 115114 (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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.

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