CPA density of states and conductivity in a double-exchange system containing impurities

Details CPA density of states and conductivity in a double-exchange system containing impurities CPA density of states and conductivity in a double-exchange system containing impurities

2000-06-11

arxiv.org/abs/cond-mat/0006184v2

Physics

Condensed Matter

5 pages, 2 eps figures, LaTex2e, EPJ macro package (style files included). The calculations done for realistic model predict t

Scientific paper

10.1007/s100510170298

We study density of states and conductivity of the doped double-exchange system, treating interaction of charge carriers both with the localized spins and with the impurities in the coherent potential approximation. It is shown that under appropriate conditions there is a gap between the conduction band and the impurity band in paramagnetic phase, while the density of states is gapless in ferromagnetic phase. This can explain metal-insulator transition frequently observed in manganites and magnetic semiconductors. Activated conductivity in the insulator phase is numerically calculated.

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