Ferromagnetism makes a doped semiconductor less shiny

Details Ferromagnetism makes a doped semiconductor less shiny Ferromagnetism makes a doped semiconductor less shiny

2004-10-19

arxiv.org/abs/cond-mat/0410481v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages 4 figures

Scientific paper

Magnetic semiconductors have attracted interest because of the question of how a magnetic metal can be derived from a paramagnetic insulator. Here our approach is to carrier dope insulating FeSi and we show that the magnetic half-metal which emerges has unprecedented optical properties, unlike those of other low carrier density magnetic metals. All traces of the semiconducting gap of FeSi are obliterated and the material is unique in being less reflective in the ferromagnetic than in the paramagnetic state, corresponding to larger rather than smaller electron scattering in the ordered phase.

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