Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

Details Infrared spectroscopic study of phonons coupled to charge excitations in FeSi Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

1996-12-04

arxiv.org/abs/cond-mat/9612045v1

Phys. Rev. B 55 (Rapid Comm.), R4863 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 10 pages, 2 postscript pictures, to be published in Phys. Rev. B Rapid Comm.

Scientific paper

10.1103/PhysRevB.55.R4863

From an investigation of the optical conductivity of FeSi single crystals using FTIR spectroscopy in the frequency range from 30 to 20000 wavenumbers we conclude that the transverse effective charge of the Fe and Si ions is approximately 4e. Of the five optical phonons which are allowed by symmetry we observe only four, three of which have a Fano line shape presumably resulting from an interaction of these modes with the electronic continuum. We show that the large oscillator strength of the phonons results from a relatively weak coupling (lambda of the order of 0.1) of the lattice degrees of freedom to an electronic resonance above the semiconductor gap, which is also responsible for the large electronic polarizability of the medium.

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