Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-11-28
Physics
Condensed Matter
Strongly Correlated Electrons
6 figures Submitted to PRB
Scientific paper
10.1103/PhysRevB.73.085205
The narrow gap semiconductor FeSi owes its strong paramagnetism to electron-correlation effects. Partial Co substitution for Fe produces a spin-polarized doped semiconductor. The spin-polarization causes suppression of the metallic reflectivity and increased scattering of charge carriers, in contrast to what happens in other magnetic semiconductors, where magnetic order reduces the scattering. The loss of metallicity continues progressively even into the fully polarized state, and entails as much as a 25% reduction in average mean-free path. We attribute the observed effect to a deepening of the potential wells presented by the randomly distributed Co atoms to the majority spin carriers. This mechanism inverts the sequence of steps for dealing with disorder and interactions from that in the classic Al'tshuler Aronov approach - where disorder amplifies the Coulomb interaction between carriers - in that here, the Coulomb interaction leads to spin polarization which in turn amplifies the disorder-induced scattering.
Aeppli Gabriel
Damascelli Andrea
der Marel Dirk van
DiTusa J. F.
Mena Patricio F.
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