E. Kogan et al., Localization and dephasing driven by magnetic fluctuations in colossal magnetoresistance materials, PHYSICA E, 9(3), 2001, pp. 374-379
Localization and dephasing of conduction electrons in a low-carrier-density
ferromagnet due to scattering on magnetic fluctuations is considered. We c
laim the existence of the "mobility edge", which separates the states with
fast diffusion and the states with slow diffusion; the latter is determined
by the dephasing time. When the "mobility edge" crosses the Fermi energy a
large and sharp change of conductivity is observed. The theory provides an
explanation for the observed temperature dependence of conductivity in fer
romagnetic semiconductors and manganite pyrochlores. (C) 2001 Elsevier Scie
nce B.V. All rights reserved.