Scaling theory of magnetoresistance in strongly disordered
ferromagnets
Gergely Zaránd
Department of Theoretical Physics
Budapest University of Technology and Economics
We present a scaling theory of magneto-transport in
Anderson-localized disordered ferromagnets. Within this framework a
pronounced magnetic-field-sensitive resistance peak emerges
naturally for temperatures near the magnetic phase transition. We find
that the resistance anomaly is a direct consequence of the change in
localization length caused by the magnetic transition. For
increasing values of the external magnetic field, the resistance
peak is gradually depleted and pushed towards higher temperatures.
Our results are in good agreement with magneto-resistance
measurements on a variety of disordered magnets.
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