Localization and dephasing driven by magnetic fluctuations in low carrier density colossal magnetoresistance materials
Abstract
Localization and dephasing of conduction electrons in a low carrier density ferromagnet due to scattering on magnetic fluctuations is considered. We claim 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 ferromagnetic semiconductors and manganite pyrochlores.
- Publication:
-
European Physical Journal B
- Pub Date:
- June 1999
- DOI:
- 10.1007/s100510050779
- arXiv:
- arXiv:cond-mat/9808065
- Bibcode:
- 1999EPJB....9..373K
- Keywords:
-
- 75.50.Pp;
- 75.70.Pa;
- 72.10.-d;
- 72.10.Di;
- Magnetic semiconductors;
- Theory of electronic transport;
- scattering mechanisms;
- Scattering by phonons magnons and other nonlocalized excitations;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Disordered Systems and Neural Networks
- E-Print:
- 4 pages, 1 eps figure, LaTex2e, EPJ macro package (style files included)