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VOLUME 43 | ISSUE 3 | PAGE 188
Fluctuation mechanism of hopping conductivity in semimagnetic semiconductors
The effect of bound magnetic polarons on the hopping conductivity is analyzed. Fluctuation jumps (without a phonon, caused by magnetization fluctuation which equalizes the energy levels of the free and occupied donors) are more likely to occur than phonon jumps (in which the phonon is absorbed at equilibrium magnetization). The activation energy depends nonmonotonically on the temperature and magnetic field and may even change sign.

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