Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 525-529 |
| Number of pages | 5 |
| Journal | European Physical Journal B |
| Volume | 19 |
| Issue number | 4 |
| DOIs | |
| State | Published - 2 Feb 2001 |
Keywords
- 72.10.-d Theory of electronic transport; scattering mechanisms
- 75.30.Vn Colossal magnetoresistance
- 75.50.Pp Magnetic semiconductors